cvsserver: Handle re-added files correctly

We can't unconditionally assign revision 1.1 to
newly added files. In case the file did exist in the
past and was deleted we need to honor the old
revision number.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-cvsserver.perl

@@ -2454,7 +2454,7 @@ sub update
                     #$log->debug("ADDED    $name");
                     $head->{$name} = {
                         name => $name,
-                        revision => 1,
+                        revision => $head->{$name}{revision} ? $head->{$name}{revision}+1 : 1,
                         filehash => $hash,
                         commithash => $commit->{hash},
                         modified => $commit->{date},