LU-11770 osc: allow build without blk_integrity or crc-t10pi

LU-11770 osc: allow build without blk_integrity or crc-t10pi

Allow the client to build if blk_integrity or crc-t10pi is not
enabled in the kernel.

Fixes: ccf3674c9ca ("LU-10472 osd-ldiskfs: T10PI between RPC and BIO")
Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I97c4e75ad084e99927bcb41cf0df8a680525a5b1
Reviewed-on: https://review.whamcloud.com/33923
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>