gitweb: Make use of the $git_dir variable at sub git_get_project_description
gitweb: Make use of the $git_dir variable at sub git_get_project_description

Signed-off-by: Bruno Ribas <4ff0562bf6074f15a3efb336333852b6f5b7c8d7@c3sl.ufpr.br>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git