Description:
------------
As tzset functions is not async-signal-safe, nor safe to be longjmp'ed out, If a timeout occurs during soem glib call, with a lock set, the PHP script will hangs.


tzset should not be called during timeout management.


Attached patch solves this.

Test script:
---------------
<?php
ini_set('max_execution_time', '1');
echo "Playing with env. and tzset";
$tabs = timezone_identifiers_list();

while (true) {
	foreach ($tabs as $tab) {
		putenv("TZ=$tab");
	}
	echo ".";
}


Must be run various time to reproduce


Expected result:
----------------
Script output "PHP Fatal error:  Maximum execution time of 1 second exceeded in..." and exit.


Actual result:
--------------
Script hangs after "PHP Fatal error:  Maximum execution time of 1 second exceeded in..."