LU-3382 build: clean unused link dependencies

LU-3382 build: clean unused link dependencies

Compiled executable Lustre files such as:
lst, lstclient, loadgen, lustre_rsync, lctl, lfs,
debugctl and ptlctl are linked against libtinfo.so.5
and libncurses.so.5, however none of the library's
symbols are used. Same issue with multiop which is
linked against librt.so.1, however uses none of the
library's symbols, and liblustre.so which is linked
against libz.so.1 and uses none of the library's
symbols as well.

Signed-off-by: Thomas Stibor <thomas@stibor.net>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I861878ca93dc0a07e2d4d718870a960eb86974a9
Reviewed-on: http://review.whamcloud.com/6427
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>