Remove FILTER_FLAG_(SCHEME|HOST)_REQUIRED

Deprecated in PHP 7.3 as part of
https://wiki.php.net/rfc/deprecations_php_7_3.

Author: nikic

UPGRADING

@@ -27,6 +27,11 @@ PHP 8.0 UPGRADE NOTES
   . Removed create_function(). Anonymous functions may be used instead.
   . Removed each(). foreach or ArrayIterator should be used instead.
 
+- Filter:
+  . The FILTER_FLAG_SCHEME_REQUIRED and FILTER_FLAG_HOST_REQUIRED flags for the
+    FILTER_VALIDATE_URL filter have been removed. The scheme and host are (and
+    have been) always required.
+
 - GD:
   . The deprecated function image2wbmp() has been removed.
     RFC: https://wiki.php.net/rfc/image2wbmp

ext/filter/filter.c

@@ -276,8 +276,6 @@ PHP_MINIT_FUNCTION(filter)
 	REGISTER_LONG_CONSTANT("FILTER_FLAG_ALLOW_THOUSAND", FILTER_FLAG_ALLOW_THOUSAND, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("FILTER_FLAG_ALLOW_SCIENTIFIC", FILTER_FLAG_ALLOW_SCIENTIFIC, CONST_CS | CONST_PERSISTENT);
 
-	REGISTER_LONG_CONSTANT("FILTER_FLAG_SCHEME_REQUIRED", FILTER_FLAG_SCHEME_REQUIRED, CONST_CS | CONST_PERSISTENT);
-	REGISTER_LONG_CONSTANT("FILTER_FLAG_HOST_REQUIRED", FILTER_FLAG_HOST_REQUIRED, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("FILTER_FLAG_PATH_REQUIRED", FILTER_FLAG_PATH_REQUIRED, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("FILTER_FLAG_QUERY_REQUIRED", FILTER_FLAG_QUERY_REQUIRED, CONST_CS | CONST_PERSISTENT);
 

ext/filter/logical_filters.c

@@ -537,11 +537,6 @@ void php_filter_validate_url(PHP_INPUT_FILTER_PARAM_DECL) /* {{{ */
 	php_url *url;
 	size_t old_len = Z_STRLEN_P(value);
 
-	if (flags & (FILTER_FLAG_SCHEME_REQUIRED | FILTER_FLAG_HOST_REQUIRED)) {
-		php_error_docref(NULL, E_DEPRECATED,
-			"explicit use of FILTER_FLAG_SCHEME_REQUIRED and FILTER_FLAG_HOST_REQUIRED is deprecated");
-	}
-
 	php_filter_url(value, flags, option_array, charset);
 
 	if (Z_TYPE_P(value) != IS_STRING || old_len != Z_STRLEN_P(value)) {