ext/standard/string.c: don't use `STR_EMPTY_ALLOC()`#19033

DanielEScherzer merged 1 commit intophp:masterphp/php-src:masterfrom

DanielEScherzer:no-STR_EMPTY_ALLOCDanielEScherzer/php-src:no-STR_EMPTY_ALLOCCopy head branch name to clipboard