appstream-glib: add missing -devel dependency on gdk-pixbuf-devel.
appstream-glib: add missing -devel dependency on gdk-pixbuf-devel.

the .pc file indicates that it requires gdk-pixbuf-2.0.

Closes: #9660 [via git-merge-pr]

necrophcodr/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,floGik/void-packages,necrophcodr/void-packages,coredumb/void-packages,coredumb/void-packages,NeoChontrix/void-packages,floGik/void-packages,floGik/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,coredumb/void-packages,necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages,floGik/void-packages,necrophcodr/void-packages,coredumb/void-packages,floGik/void-packages,coredumb/void-packages,floGik/void-packages