Moved mu_mktime to mutil.c as mu_tm2time, and removed mu_mktime.c

-/* Copyright (C) 2001 Free Software Foundation, Inc.
-   A wrapper for mktime function allowing to specify the timezone.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
-
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <time.h>
-
-/* Convert struct tm into time_t, taking into account timezone offset */
-time_t
-mu_mktime (struct tm *timeptr, int tz)
-{
-  static int mu_timezone;
-  
-  if (mu_timezone == 0)
-    {
-	struct tm *tm;
-	time_t t = 0;
-	tm = gmtime(&t);
-	mu_timezone = mktime(tm);
-    }
-  return mktime(timeptr) - mu_timezone + tz;
-}