- Drop libudev-dev, no longer required.
- Add gtk-doc-tools and libglib2.0-doc for the API documentation in
  libudev and libgudev.
- Add libgirepository1.0-dev and gobject-introspection for GObject
  introspection support in libgudev.
- Add libgcrypt11-dev for encryption support in the journal.
- Add libblkid-dev for the blkid udev builtin.