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[libc] Initiliaze tz before use in localtime()

Tz was used before being initialized. The more generic solution is to
call _tzone with the timep received, and let to the implementation of
_tzone to decide how to use that parameter or to ignore it.

--- a/src/libc/time/asctime.c

+++ b/src/libc/time/asctime.c

@@ -1,7 +1,6 @@

 #include <time.h>

 #undef asctime

-#include <stdio.h> // TODO: remove me!

 char *

 asctime(const struct tm *tm)

 {

--- a/src/libc/time/localtime.c

+++ b/src/libc/time/localtime.c

@@ -10,10 +10,10 @@

 	struct tm *tm;

 	time_t t = *timep;

+	tz = _tzone(gmtime(timep));

 	t += tz->gmtoff * 60;

 	t += tz->isdst * 60;

 	tm = gmtime(&t);

-	tz = _tzone(tm);

 	tm->tm_zone = tz->name;

 	tm->tm_isdst = tz->isdst;

 	tm->tm_gmtoff = tz->gmtoff;