Fix #77993: Wrong parse error for invalid hex literal on Windows

If a PHP file contains an invalid hex literal such as `0x_10`, the expected error
is `Parse error: syntax error, unexpected 'x_10' (T_STRING) in %s on line %d`.

This already worked correctly on Linux, but on Windows prior to this patch a different
error was produced: `Parse error: Invalid numeric literal in %s on line %d`.

Author: theodorejb

Zend/tests/bug77993.phpt

@@ -0,0 +1,7 @@
+--TEST--
+Bug #77993 (Wrong parse error for invalid hex literal on Windows)
+--FILE--
+<?php
+0xg10;
+--EXPECTF--
+Parse error: syntax error, unexpected 'xg10' (T_STRING) in %s on line %d