ext/curl: Bump minimim Curl version to >= 7.61.0

Bumps the minimum required libcurl version to 7.61.0.

Please also see php#4917, which bumped minimum libcurl version to the current >= 7.29.0.
This bumps the minimum requirement to Curl 7.61.0 (released 2018 Sept).

Ubuntu, Debian, RHEL, and RHEL derivatives have major and LTS version bumps this year. Following are the
libcurl-dev/libcurl-devel versions available in the oldest supported (LTS or otherwise) in major OSs.

 - Debian buster: [7.64](https://packages.debian.org/buster/libcurl4-openssl-dev)
 - Ubuntu 20.04: [7.68](https://packages.ubuntu.com/focal/libcurl-dev)
 - CentOS/RHEL 7: 7.29
 - RHEL 8/Rocky 8/EL 8: 7.61
 - Fedora 38: 7.87

RHEL/CentOS 7 reaches EOL mid 2024, so for PHP 8.4 scheduled towards the end of this year, we can safely
bump the minimum libcurl version.

7.61.0 was selected as the new minimum because RHEL and derivatives have libcurl-devel version 7.61. RHEL 8 is
a current and supported RHEL version.

Author: Ayesh

ext/curl/config.m4

@@ -4,7 +4,7 @@ PHP_ARG_WITH([curl],
     [Include cURL support])])
 
 if test "$PHP_CURL" != "no"; then
-  PKG_CHECK_MODULES([CURL], [libcurl >= 7.29.0])
+  PKG_CHECK_MODULES([CURL], [libcurl >= 7.61.0])
   PKG_CHECK_VAR([CURL_FEATURES], [libcurl], [supported_features])
 
   PHP_EVAL_LIBLINE($CURL_LIBS, CURL_SHARED_LIBADD)

ext/curl/curl.stub.php

@@ -472,13 +472,11 @@
  * @cvalue CURLOPT_WRITEHEADER
  */
 const CURLOPT_WRITEHEADER = UNKNOWN;
-#if LIBCURL_VERSION_NUM >= 0x072000
 /**
  * @var int
  * @cvalue CURLOPT_XFERINFOFUNCTION
  */
 const CURLOPT_XFERINFOFUNCTION = UNKNOWN;
-#endif
 
 /* */
 /**
@@ -776,13 +774,11 @@
  * @cvalue CURLE_SSL_PEER_CERTIFICATE
  */
 const CURLE_SSL_PEER_CERTIFICATE = UNKNOWN;
-#if LIBCURL_VERSION_NUM >= 0x072700 /* Available since 7.39.0 */
 /**
  * @var int
  * @cvalue CURLE_SSL_PINNEDPUBKEYNOTMATCH
  */
 const CURLE_SSL_PINNEDPUBKEYNOTMATCH = UNKNOWN;
-#endif
 /**
  * @var int
  * @cvalue CURLE_TELNET_OPTION_SYNTAX
@@ -998,13 +994,12 @@
  * @cvalue CURLM_OUT_OF_MEMORY
  */
 const CURLM_OUT_OF_MEMORY = UNKNOWN;
-#if LIBCURL_VERSION_NUM >= 0x072001 /* Available since 7.32.1 */
+/* Available since 7.32.1 */
 /**
  * @var int
  * @cvalue CURLM_ADDED_ALREADY
  */
 const CURLM_ADDED_ALREADY = UNKNOWN;
-#endif
 
 /* Curl proxy constants */
 /**
@@ -2385,7 +2380,7 @@
  */
 const CURLSSH_AUTH_AGENT = UNKNOWN;
 
-#if LIBCURL_VERSION_NUM >= 0x071e00 /* Available since 7.30.0 */
+/* Available since 7.30.0 */
 /**
  * @var int
  * @cvalue CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE
@@ -2411,17 +2406,14 @@
  * @cvalue CURLMOPT_MAX_TOTAL_CONNECTIONS
  */
 const CURLMOPT_MAX_TOTAL_CONNECTIONS = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x071f00 /* Available since 7.31.0 */
+/* Available since 7.31.0 */
 /**
  * @var int
  * @cvalue CURLOPT_SASL_IR
  */
 const CURLOPT_SASL_IR = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072100 /* Available since 7.33.0 */
 /**
  * @var int
  * @cvalue CURLOPT_DNS_INTERFACE
@@ -2453,9 +2445,7 @@
  * @cvalue CURL_VERSION_HTTP2
  */
 const CURL_VERSION_HTTP2 = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072200 /* Available since 7.34.0 */
 /**
  * @var int
  * @cvalue CURLOPT_LOGIN_OPTIONS
@@ -2477,9 +2467,7 @@
  * @cvalue CURL_SSLVERSION_TLSv1_2
  */
 const CURL_SSLVERSION_TLSv1_2 = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072400 /* Available since 7.36.0 */
 /**
  * @var int
  * @cvalue CURLOPT_EXPECT_100_TIMEOUT_MS
@@ -2495,9 +2483,7 @@
  * @cvalue CURLOPT_SSL_ENABLE_NPN
  */
 const CURLOPT_SSL_ENABLE_NPN = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072500 /* Available since 7.37.0 */
 /**
  * @var int
  * @cvalue CURLHEADER_SEPARATE
@@ -2518,9 +2504,7 @@
  * @cvalue CURLOPT_PROXYHEADER
  */
 const CURLOPT_PROXYHEADER = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072600 /* Available since 7.38.0 */
 /**
  * @var int
  * @cvalue CURLAUTH_NEGOTIATE
@@ -2531,17 +2515,13 @@
  * @cvalue CURL_VERSION_GSSAPI
  */
 const CURL_VERSION_GSSAPI = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072700 /* Available since 7.39.0 */
 /**
  * @var int
  * @cvalue CURLOPT_PINNEDPUBLICKEY
  */
 const CURLOPT_PINNEDPUBLICKEY = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072800 /* Available since 7.40.0 */
 /**
  * @var int
  * @cvalue CURLOPT_UNIX_SOCKET_PATH
@@ -2567,15 +2547,12 @@
  * @cvalue CURL_VERSION_UNIX_SOCKETS
  */
 const CURL_VERSION_UNIX_SOCKETS = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072900 /* Available since 7.41.0 */
 /**
  * @var int
  * @cvalue CURLOPT_SSL_VERIFYSTATUS
  */
 const CURLOPT_SSL_VERIFYSTATUS = UNKNOWN;
-#endif
 
 #if LIBCURL_VERSION_NUM >= 0x072a00 /* Available since 7.42.0 */
 /**
@@ -2682,15 +2659,12 @@
 const CURL_VERSION_PSL = UNKNOWN;
 #endif
 
-#if LIBCURL_VERSION_NUM >= 0x073000 /* Available since 7.48.0 */
 /**
  * @var int
  * @cvalue CURLOPT_TFTP_NO_OPTIONS
  */
 const CURLOPT_TFTP_NO_OPTIONS = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073100 /* Available since 7.49.0 */
 /**
  * @var int
  * @cvalue CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
@@ -2706,17 +2680,13 @@
  * @cvalue CURLOPT_TCP_FASTOPEN
  */
 const CURLOPT_TCP_FASTOPEN = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073200 /* Available since 7.50.0 */
 /**
  * @var int
  * @cvalue CURLINFO_HTTP_VERSION
  */
 const CURLINFO_HTTP_VERSION = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073300 /* Available since 7.51.0 */
 /**
  * @var int
  * @cvalue CURLE_WEIRD_SERVER_REPLY
@@ -2727,9 +2697,7 @@
  * @cvalue CURLOPT_KEEP_SENDING_ON_ERROR
  */
 const CURLOPT_KEEP_SENDING_ON_ERROR = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073400 /* Available since 7.52.0 */
 /**
  * @var int
  * @cvalue CURL_SSLVERSION_TLSv1_3
@@ -2850,9 +2818,7 @@
  * @cvalue CURLPROXY_HTTPS
  */
 const CURLPROXY_HTTPS = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073500 /* Available since 7.53.0 */
 /**
  * @var int
  * @cvalue CURL_MAX_READ_SIZE
@@ -2863,9 +2829,7 @@
  * @cvalue CURLOPT_ABSTRACT_UNIX_SOCKET
  */
 const CURLOPT_ABSTRACT_UNIX_SOCKET = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073600 /* Available since 7.54.0 */
 /**
  * @var int
  * @cvalue CURL_SSLVERSION_MAX_DEFAULT
@@ -2901,17 +2865,13 @@
  * @cvalue CURLOPT_SUPPRESS_CONNECT_HEADERS
  */
 const CURLOPT_SUPPRESS_CONNECT_HEADERS = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073601 /* Available since 7.54.1 */
 /**
  * @var int
  * @cvalue CURLAUTH_GSSAPI
  */
 const CURLAUTH_GSSAPI = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073700 /* Available since 7.55.0 */
 /**
  * @var int
  * @cvalue CURLINFO_CONTENT_LENGTH_DOWNLOAD_T
@@ -2952,9 +2912,7 @@
  * @cvalue CURLOPT_SOCKS5_AUTH
  */
 const CURLOPT_SOCKS5_AUTH = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073800 /* Available since 7.56.0 */
 /**
  * @var int
  * @cvalue CURLOPT_SSH_COMPRESSION
@@ -2965,9 +2923,7 @@
  * @cvalue CURL_VERSION_MULTI_SSL
  */
 const CURL_VERSION_MULTI_SSL = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073900 /* Available since 7.57.0 */
 /**
  * @var int
  * @cvalue CURL_VERSION_BROTLI
@@ -2978,17 +2934,13 @@
  * @cvalue CURL_LOCK_DATA_CONNECT
  */
 const CURL_LOCK_DATA_CONNECT = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073a00 /* Available since 7.58.0 */
 /**
  * @var int
  * @cvalue CURLSSH_AUTH_GSSAPI
  */
 const CURLSSH_AUTH_GSSAPI = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073b00 /* Available since 7.59.0 */
 /**
  * @var int
  * @cvalue CURLINFO_FILETIME_T
@@ -3004,9 +2956,7 @@
  * @cvalue CURLOPT_TIMEVALUE_LARGE
  */
 const CURLOPT_TIMEVALUE_LARGE = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073c00 /* Available since 7.60.0 */
 /**
  * @var int
  * @cvalue CURLOPT_DNS_SHUFFLE_ADDRESSES
@@ -3017,9 +2967,7 @@
  * @cvalue CURLOPT_HAPROXYPROTOCOL
  */
 const CURLOPT_HAPROXYPROTOCOL = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x073d00 /* Available since 7.61.0 */
 /**
  * @var int
  * @cvalue CURL_LOCK_DATA_PSL
@@ -3080,7 +3028,6 @@
  * @cvalue CURLOPT_TLS13_CIPHERS
  */
 const CURLOPT_TLS13_CIPHERS = UNKNOWN;
-#endif
 
 #if LIBCURL_VERSION_NUM >= 0x073E00 /* Available since 7.62.0 */
 /**