part#1 cherry-picked commits from dsc-kernel-project/ICS (upstream):
a4875147a6f29b908162a81a2773a3cbab2433c8 by hunderteins <wegegeld@web.de> -  Add optimized AES and SHA1 routines
cca3c4e40e3765239afabea6d5682715b3f92849 by hunderteins <wegegeld@web.de> -  support XZ compressed kernels
8c63eb0cb591c6bae7db5d170581cbf5ab793d74 by hunderteins <wegegeld@web.de> -  support XZ compressed kernels part2
part#2: xt_qtaguid support from dsc-kernel-project/ics (my own branch)