[php-src] Issue #8453: Unable to build if Valgrind is available

Issue: https://github.com/php/php-src/issues/8453 Author: vobruba-martin ### Description [This code](https://github.com/php/php-src/blob/PHP-8.1.6/Zend/zend_string.c#L369-L378) doesn't seem right: ```c /* Even if we don't build with valgrind support, include the symbol so that valgrind available * only at runtime will not result in false positives. */ #ifndef HAVE_VALGRIND # define I_REPLACE_SONAME_FNNAME_ZU(soname, fnname) _vgr00000ZU_ ## soname ## _ ## fnname #endif ZEND_API bool ZEND_FASTCALL I_REPLACE_SONAME_FNNAME_ZU(NONE,zend_string_equal_val)(zend_string *s1, zend_string *s2) { return !memcmp(ZSTR_VAL(s1), ZSTR_VAL(s2), ZSTR_LEN(s1)); } ``` Build fails with this error: ``` Zend/zend_string.c:375:29: error: ‘I_REPLACE_SONAME_FNNAME_ZU’ declared as function returning a function ZEND_API bool ZEND_FASTCALL I_REPLACE_SONAME_FNNAME_ZU(NONE,zend_string_equal_val)(zend_string *s1, zend_string *s2) ``` As a workaround I had to use --without-valgrind to make the build successful. ### PHP Version PHP 8.1.5 ### Operating System _No response_