Merge branch 'mj/gitweb-unreadable-config-error'

When given an existing but unreadable file as a configuration file,
gitweb behaved as if the file did not exist at all, but now it
errors out.  This is a change that may break backward compatibility.

* mj/gitweb-unreadable-config-error:
  gitweb: die when a configuration file cannot be read

diff --cc gitweb/gitweb.perl
Simple merge