Add extract dol/apploader options back for gc disks.

It was removed from the menu for the disk item in 868c6278, but we want to keep it there for gc games, since they don't have separate partitions.
Merge pull request #182 from RachelBryk/extract-gc-dol

Add extract dol/apploader options back for gc disks.
OGL/VertexManager: Minor cleanup of if case
OGL/VertexManager: Do not check if g_nativeVertexFmt is zero

The variable is already dereferenced both before and after this
check which means that if this variable would ever be zero it would
have crashed dolphin already.
Merge pull request #191 from Jezze/for-dolphin

Some cleanups for OGL/Vertexmanager.cpp