We use GLES2 for drawing. There is currently no reason to provide full GL
inside kmscon as we use the basic operations only.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm_video can work with any backend so we need a DRM backend to get the
same functionality as our previous compositor/output API.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>