configure: enable the surfaceless platform by default

A simple platform that you want to use in a many usecases. See the
spec file details.

It has no special requirements plus it takes less than a second to
build.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
2 files changed