Fix #71882 amendment: Negative ftruncate() on php://memory exhausts memory

To avoid BC breaks, we do not raise a warning for now.

Author: cmb69

ext/standard/file.c

@@ -1513,7 +1513,7 @@ PHP_NAMED_FUNCTION(php_if_ftruncate)
 	}
 
 	if (size < 0) {
-		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Negative size is not supported");
+		/* php_error_docref(NULL TSRMLS_CC, E_WARNING, "Negative size is not supported"); */
 		RETURN_FALSE;
 	}