These functions aren't used by anything else, and are specific to the
temporary-upload-as-a-weird-format path of glamor_render.c, called
through glamor_upload_picture_to_texture().

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>