TODO: remove "SDL port", it's been done by now

Upstream SDL supports Wayland since v2.0.4 (June 2015):
https://forums.libsdl.org/viewtopic.php?t=11294



Just set SDL_VIDEODRIVER=wayland and SDL will do the right thing :)

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>