Fix install of pkgconfig files and allow use of OGG_ROOT variable
Fix install of pkgconfig files and allow use of OGG_ROOT variable

erikd/vorbis,erikd/vorbis,erikd/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,erikd/vorbis,ShiftMediaProject/vorbis