lcov: use UTC to get timezone-independent date

The date is used for updating the time inside manpages.
If localtime is used, the date could vary depending on the user's
timezone. To enable reproducible builds, UTC is used instead.

Signed-off-by: Reiner Herrmann <[email protected]>

Author: reinerh

bin/updateversion.pl

@@ -83,7 +83,7 @@ ($)
 
 	return (0, 0, 0) if (!-e $filename);
 	@stat = stat($filename);
-	($sec, $min, $hour, $day, $month, $year) = localtime($stat[9]);
+	($sec, $min, $hour, $day, $month, $year) = gmtime($stat[9]);
 	$year += 1900;
 	$month += 1;