LU-13127 libcfs: make noise to console if CRC32 is missing

LU-13127 libcfs: make noise to console if CRC32 is missing

if CRC32 support is disabled in the kernel by mistake, then
early replies don't work and the actual cause isn't obvious.

the patch also adds a check at configure to ensure that
target kernel support CRC32 crypto function.

Change-Id: I17999ae89eaf6c4fb7c7db12200e2092cc6afea8
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/37214
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>