Log Message:
- Include shared-mime-info/mimedb.mk to handle the mime database properly.
- Include desktop-file-utils/desktopdb.mk to handle the mime types defined
  in the desktop file properly.
- Depend on pkg-config, needed at build time.
- Use xdg-dirs, not gnome2-dirs.  The former is enough.
- Sort dependencies.
- Regenerate the PLIST so that it's sorted and to avoid lots of files that
  shouldn't be there (handled automatically by mimedb.mk and desktopdb.mk).
- Bump PKGREVISION to 1.