Add support for kernels compressed with bzip2, lzma or lzo to the
extract-ikconfig script.

Fixes kernel bugzilla #19852:
https://bugzilla.kernel.org/show_bug.cgi?id=19852Signed-off-by: Dick Streefland <dick@streefland.net>
Tested-by: Justin <jlec@gentoo.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>