changes to enable building of spl, zfs and osd-zfs.

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I01dcc211b6943b3ed19eaf8756397a97095bbc59
Reviewed-on: http://review.whamcloud.com/2885


Tested-by: Hudson
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>