glib2: fix host build offline download

glib2: fix host build offline download

If buildsystem does not have a internet connection, then the build
fails. This is because of the fact, that glib2 is downloading and building
the missing dependencies during host compilation.

This cannot be allowed to happen. The package must also be built without
an internet connection.

Adding the missing host build dependency and removing the 'forcefallback'
fixes this issue.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>