package/libgudev: add gobject-introspection optional dependency

package/libgudev: add gobject-introspection optional dependency

gobject-introspection is an optional dependency (which is enabled by
default) since at least version 219 and
https://gitlab.gnome.org/GNOME/libgudev/-/commit/43a593b5b4097b887e49eaacafbc1337bd709718

Fixes:
 - http://autobuild.buildroot.org/results/3bedc9fa3b14939825fb9cdebc6977057c3f6118

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>