Fix GH-13727: PHP_TEST_BUILD macro generating invalid call test prototypes.

Author: devnexen

build/php.m4

@@ -1643,7 +1643,7 @@ AC_DEFUN([PHP_TEST_BUILD], [
   LIBS="$4 $LIBS"
   AC_LINK_IFELSE([AC_LANG_SOURCE([[
     $5
-    char $1();
+    char $1(void);
     int main() {
       $1();
       return 0;