cogl: delete texture-from-foreign
As noted in <cogl-texture-2d-gl.h>
(now also removed), this is for allowing external GL callers to promote one of their textures to a CoglTexture. We aren't doing that and don't want to start.
As noted in <cogl-texture-2d-gl.h>
(now also removed), this is for allowing external GL callers to promote one of their textures to a CoglTexture. We aren't doing that and don't want to start.