libglib2: add host-util-linux for host variant

It's required now, fixes:
http://autobuild.buildroot.net/results/e81/e81f98561867d370115a019284682c0611796978/



Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>