[GPOS] Fix GPOS feature lookup lookups and application
[GPOS] Fix GPOS feature lookup lookups and application

OpenInkpot-archive/iplinux-pango1.0,danny-ku/pango,zsx/pango,zsx/pango,danny-ku/pango,kari-lentz/alpha-pango,zsx/pango,kari-lentz/alpha-pango,OpenInkpot-archive/iplinux-pango1.0,Distrotech/pango,kari-lentz/alpha-pango,kari-lentz/alpha-pango,danny-ku/pango,zsx/pango,Distrotech/pango,OpenInkpot-archive/iplinux-pango1.0,Distrotech/pango