Bug 1480315 - Fix coredump caused by getenv. r=glandium

--HG--
extra : amend_source : dbd613ec9ed864aa07e957fc181e2554097d1cc5

mozglue/misc/TimeStamp.cpp

@@ -11,6 +11,7 @@
 #include "mozilla/TimeStamp.h"
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 namespace mozilla {