Make some zend_test dependencies explicit

Rather than checking that specific functions exist.

Author: nikic

ext/sockets/tests/socket_export_stream-5.phpt

@@ -2,12 +2,7 @@
 socket_export_stream: effects of leaked handles
 --EXTENSIONS--
 sockets
---SKIPIF--
-<?php
-
-if (!function_exists('zend_leak_variable'))
-    die('SKIP only for debug builds');
-?>
+zend_test
 --INI--
 report_memleaks=0
 --FILE--

ext/sockets/tests/socket_import_stream-5.phpt

@@ -2,12 +2,7 @@
 socket_import_stream: effects of leaked handles
 --EXTENSIONS--
 sockets
---SKIPIF--
-<?php
-
-if (!function_exists('zend_leak_variable'))
-    die('SKIP only for debug builds');
-?>
+zend_test
 --INI--
 report_memleaks=0
 --FILE--

ext/standard/tests/file/bug52820.phpt

@@ -2,10 +2,9 @@
 Bug #52820 (writes to fopencookie FILE* not committed when seeking the stream)
 --EXTENSIONS--
 curl
+zend_test
 --SKIPIF--
 <?php
-if (!function_exists('zend_leak_variable'))
-   die("skip only for debug builds");
 /* unfortunately no standard function does a cast to FILE*, so we need
  * curl to test this */
 $handle=curl_init('file:///i_dont_exist/');

ext/standard/tests/file/stream_enclosed.phpt

@@ -1,8 +1,7 @@
 --TEST--
 Unexposed/leaked stream encloses another stream
---SKIPIF--
-<?php
-if (!function_exists('zend_leak_variable')) die("skip only debug builds");
+--EXTENSIONS--
+zend_test
 --FILE--
 <?php
 $s = fopen('php://temp/maxmemory=1024','wb+');

ext/standard/tests/strings/strcmp_unterminated.phpt

@@ -1,9 +1,7 @@
 --TEST--
 strnat(case)cmp(): potential OOB access for unterminated strings
---SKIPIF--
-<?php
-if (!function_exists('zend_create_unterminated_string')) die('skip zend_test extension not available');
-?>
+--EXTENSIONS--
+zend_test
 --FILE--
 <?php
 $a = zend_create_unterminated_string('333');

ext/standard/tests/url/parse_url_unterminated.phpt

@@ -1,9 +1,7 @@
 --TEST--
 Test parse_url() function: Parse unterminated string
---SKIPIF--
-<?php
-if (!function_exists('zend_create_unterminated_string')) die('skip ext/test required');
-?>
+--EXTENSIONS--
+zend_test
 --FILE--
 <?php