LU-11160 build: Fix uuid / blkid dependency

LU-11160 build: Fix uuid / blkid dependency

UUID dependency stems from libblkid, so only link with uuid if blkid
is present.

Signed-off-by: Nathaniel Clark <nclark@whamcloud.com>
Change-Id: If1cc293cc48210a065f8910ea655615b11268b5c
Reviewed-on: https://review.whamcloud.com/32842
Reviewed-by: Quentin Bouget <quentin.bouget@cea.fr>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>