gdate: Use a more recent year when fetching the month names. Fixes #1386

g_date_strftime() on Windows uses the SYSTEMTIME structure which requires the
year to be >=1601. Passing 1 results in a negative SYSTEMTIME.wYear
which makes GetDateFormatW() fail and crashes due to missing error handling.

Just use 1976 as that's already used a few lines down.

glib/gdate.c

@@ -1088,7 +1088,7 @@ g_date_prepare_to_parse (const gchar      *str,
         {
 	  gchar *casefold;
 	  
-          g_date_set_dmy (&d, 1, i, 1);
+          g_date_set_dmy (&d, 1, i, 1976);
 	  
           g_return_if_fail (g_date_valid (&d));