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add reverse timezone mapping in mktime

#include "dietfeatures.h"
#include <time.h>
#include <sys/time.h>

#ifdef WANT_TZFILE_PARSER
extern void __maplocaltime(void);
extern time_t __tzfile_map(time_t t, int *isdst, int forward);
#else
extern long int timezone;
extern int daylight;
#endif

struct tm* localtime_r(const time_t* t, struct tm* r) {
  time_t tmp;
#ifdef WANT_TZFILE_PARSER
  __maplocaltime();
  tmp=__tzfile_map(*t,&r->tm_isdst,1);
#else
  struct timezone tz;
  gettimeofday(0, &tz);
  timezone=tz.tz_minuteswest*60L;
  tmp=*t+timezone;
#endif
  return gmtime_r(&tmp,r);
}