Moved to git: xdg-user-dirs, default-icon-theme, xdgmime, shared-mime-info

[Alexander Larsson]

The following are the new git repos for these:

http://cgit.freedesktop.org/xdg/default-icon-theme/
http://cgit.freedesktop.org/xdg/shared-mime-info/
http://cgit.freedesktop.org/xdg/xdg-user-dirs/
http://cgit.freedesktop.org/xdg/xdgmime/

The cvs repos are still availible as before, but I made them all not
build, instead printing a reference to the new git repository.