Renaming linux-c6-gdk-pixbuf to linux-c6-gdk-pixbuf2 in category to unbreak
INDEX.

Spotted by:	cperciva
Approved by:	swills (mentor)
Renaming linux-c6-gdk-pixbuf to linux-c6-gdk-pixbuf2 in emulators/linux-c6 to
unbreak INDEX (part two)

Spotted by:	cperciva
Approved by:	swills
Hook some ports to the build