LU-2288 build: Support build-id links for kernel modules

LU-2288 build: Support build-id links for kernel modules

Follow RHEL practice of making kernel modules executable so that their
build-id links are installed and perf an other tools can find
their debuginfo thereby.

Change-Id: I1a288fda0948424b85a61cf4294319dbbe05dd81
Signed-off-by: John L. Hammond <jhammond@tacc.utexas.edu>
Reviewed-on: http://review.whamcloud.com/4491
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Brian J. Murrell <brian.murrell@intel.com>
Reviewed-by: Keith Mannthey <kemannthey@gmail.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>