compile, parse_acl: treat foo/CREATER (no regex metas) correctly

Teemu's testing brought up a situtation I had not anticipated:
"repo foo/CREATER" looks like a non-regex, and its creation then (a)
goes by "W" permissions instead of "C" permissions, and (b) the
creater's name does not get recorded (no gl-creater file).

    SIDE NOTE: one way is to reduce the paranoia, and just put the
    creater name in anyway.  Treat a repo created from gl-auth as a
    wildcard-matched autovivified repo, because the *other* kind would
    have actually got created by gl-compile anyway.

    However, I can think of *one* very far-out situation where this
    could backfire on an unwary admin, and I'm paranoid :-)

So we need to force it to look like a regex.  Moving the line-anchoring
from `parse_acl` to gl-compile sounded fine, until I realised that the
"$" isn't easy.  Backslashitis, bigtime, plus the single/double quote
tricks we're playing with the dumped hash adds its own complexities.

Best of both worlds, promote the "^" to gl-compile, keep the "$" where
it is...!

src/gitolite.pm

@@ -177,9 +177,15 @@ sub parse_acl
     return unless $repo;
 
     return $ENV{GL_REPOPATT} = "" if $repos{$repo};
-    my @matched = grep { $repo =~ /^$_$/ } sort keys %repos;
+
+    # didn't find $repo in %repos, so it must be a wildcard-match case
+
+    # note that the repo regexes in %repos have a leading ^ but not a trailing
+    # $; we need to add the $ here to complete the "line-anchoring"
+    my @matched = grep { $repo =~ /$_$/ } sort keys %repos;
     die "$repo has no matches\n" unless @matched;
     die "$repo has multiple matches\n@matched\n" if @matched > 1;
+
     # found exactly one pattern that matched, copy its ACL
     $repos{$repo} = $repos{$matched[0]};
     # and return the pattern