lib/lzo: Update LZO compression to current upstream version

This commit updates the kernel LZO code to the current upsteam version
which features a significant speed improvement - benchmarking the Calgary
and Silesia test corpora typically shows a doubled performance in
both compression and decompression on modern i386/x86_64/powerpc machines.

Change-Id: Iaa6e560ebbc663aac382187b7cd9d52ba8a3329d
Signed-off-by: Markus F.X.J. Oberhumer <markus@oberhumer.com>