glsl: make sure that textureProj(bias) variants are only exposed in fs

Many were already marked as fs_only, but not all. This fixes the
remaining ir_txb entries.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
1 file changed