Removed broken php_url_encode_hash macro

Broken since ~15 years ago (2994c23)

Closes GH-6253.

Author: patrickallaert

ext/standard/php_http.h

@@ -25,6 +25,5 @@ PHPAPI void php_url_encode_hash_ex(HashTable *ht, smart_str *formstr,
 				const char *key_prefix, size_t key_prefix_len,
 				const char *key_suffix, size_t key_suffix_len,
 				zval *type, const char *arg_sep, int enc_type);
-#define php_url_encode_hash(ht, formstr)	php_url_encode_hash_ex((ht), (formstr), NULL, 0, NULL, 0, NULL, 0, NULL)
 
 #endif