git-relink: avoid hard linking in objects/info directory

git-relink is intended to search for packs and loose objects in
common between two repositories and to replace the one set with
hard links to the other. Files other than packs and loose objects
should not be touched, so add the "info" sub-directory to the
pattern of directory excludes.
Signed-off-by: NBrandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git-relink.perl

@@ -40,7 +40,7 @@
 opendir(D,$master_dir . "objects/")
 	or die "Failed to open $master_dir/objects/ : $!";
 
-my @hashdirs = grep !/^\.{1,2}$/, readdir(D);
+my @hashdirs = grep { ($_ eq 'pack') || /^[0-9a-f]{2}$/ } readdir(D);
 
 foreach my $repo (@dirs) {
 	$linked = 0;