Multilock tool: Fix for using it with AIX.

Ported from 1.5 2e9e37f10e8c4d6f2f68994f2e8304d63cd7219a

Signed-off-by: suhrud <supatank@in.ibm.com>
Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
Update porting doc to reflect EXP work mostly completed and up to 1.5.0.rev13

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>