mesa: Implement _mesa_all_varyings_in_vbos.

Implement the equivalent of vbo_all_varyings_in_vbos for
vertex array objects.

v2: Update comment.

Signed-off-by: Mathias Fröhlich <Mathias.Froehlich@web.de>
Reviewed-by: Eric Anholt <eric@anholt.net>
2 files changed