Needed to initialize time_t to 0 in GetTimeZone to prevent a arithmetic underflow in VA 4.0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9071 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/datetime.cpp

@@ -247,9 +247,9 @@ static int GetTimeZone()
     {
         // just call localtime() instead of figuring out whether this system
         // supports tzset(), _tzset() or something else
-        time_t t;
-        (void)localtime(&t);
+        time_t                 t = 0;
 
+        (void)localtime(&t);
         s_timezoneSet = TRUE;
     }