plugins: rtc: Move TZ set/unset to rtc plugin from Finit main

This patch makes the RTC plugin a bit more stand-alone, it is now also
back in the hands of the user to set a default timezone.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/finit.c

@@ -321,14 +321,11 @@ int main(int argc, char *argv[])
 	ctx = &loop;
 
 	/*
-	 * Set PATH, SHELL, PWD, TZ and umask early to something sane
+	 * Set PATH, SHELL, PWD, and umask early to something sane
 	 */
 	setenv("PATH", _PATH_STDPATH, 1);
 	setenv("SHELL", _PATH_BSHELL, 1);
 
-	setenv("TZ", "UTC0", 1);
-	tzset();
-
 	chdir("/");
 	umask(0);