Add support for using the atomic-modesetting API to apply output state. Unlike previous series, this commit does not unflip sprites_are_broken, until further work has been done with assign_planes to make it reliable.
598ee9dd compositor-drm: Atomic modesetting support
configure.ac | 2 +-
libweston/compositor-drm.c | 506 ++++++++++++++++++++++++++++++++++++++-------
2 files changed, 434 insertions(+), 74 deletions(-)