add gobject-introspection as a build-dependency

For some reason, even though we don't USE it, we still depend on it
to build because autotools is dumb as a rock.

Signed-off-by: Matt Sealey <matt@genesi-usa.com>
Bump to upower-0.9.5-4genesi4

Signed-off-by: Matt Sealey <matt@genesi-usa.com>