Fix #78684: PCRE bug72463_2 test is sending emails on Linux

This test is not supposed to run on non Windows systems; otherwise it
would try to send an email.

Author: cmb69

NEWS

@@ -8,6 +8,9 @@ PHP                                                                        NEWS
 - Date:
   . Fixed bug #70153 (\DateInterval incorrectly unserialized). (Maksim Iakunin)
 
+- Testing:
+  . Fixed bug #78684 (PCRE bug72463_2 test is sending emails on Linux). (cmb)
+
 17 Oct 2019, PHP 7.4.0RC4
 
 - Core:

ext/pcre/tests/bug72463_2.phpt

@@ -1,5 +1,11 @@
 --TEST--
 Bug #72463 mail fails with invalid argument
+--SKIPIF--
+<?php
+if(substr(PHP_OS, 0, 3) != "WIN") {
+	die('skip windows only');
+}
+?>
 --INI--
 SMTP=non.existent.smtp.server
 --FILE--