lib?lzo: Update LZO cpmression to current upstream version
This commit updates the kernel LZO code to the current upstream version
which features a significant speed improvement - benchmarking the Calgary
and Silesia test corpora typically shows a doubled perfoemance in
both compression and decompression on mpdern i386/x86_64/powerpc machines.

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