git svn fetch: Create correct commit timestamp when using --localtime

In parse_svn_date() prepend the correct UTC offset to the timestamp
returned.  This is the offset in effect at the commit time instead of
the offset in effect at calling time.

Signed-off-by: Urs Thuermann <urs@isnogud.escape.de>
Reviewed-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

perl/Git/SVN.pm

@@ -1416,7 +1416,7 @@ sub parse_svn_date {
 			delete $ENV{TZ};
 		}
 
-		my $our_TZ = get_tz_offset();
+		my $our_TZ = get_tz_offset($epoch_in_UTC);
 
 		# This converts $epoch_in_UTC into our local timezone.
 		my ($sec, $min, $hour, $mday, $mon, $year,