New package: ImLib2

[Peter: Config.in tweaks, fix build without X]
Signed-off-by: Frederic Bassaler <frederic.bassaler@gmail.com>
Signed-off-by: Matias Garcia <mgarcia@rossvideo.com>
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Tested-By: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>