log elapsed time

I'm an idiot.  I say I won't do it, then I go and do it anyway.

Fortunately, in this case, the code and execution remain exactly the
same for people who do not set $GL_PERFLOGT in the rc file, so it's
tolerable.

<evil grin> People who want even more than this can contact Greg Lonnon
(see the mailing list archives at
http://groups.google.com/group/gitolite for an obfuscated but easy to
guess email address) ;-)

src/gl-setup-authkeys

@@ -24,6 +24,8 @@
 # All in all, unless it is shown to be quite inefficient, I'd much
 # prefer processing *all* keys each time there is a change.
 
+our ($GL_PERFLOGT);
+
 # setup
 my $bindir = $0;
 $bindir =~ s/\/[^\/]+$//;