LU-4369 build: make --disable-ldiskfs option workable

LU-4369 build: make --disable-ldiskfs option workable

Building ldiskfs is enabled by default, so we need to disable it
if --disable-ldiskfs option is specified to ./configure

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: I7ffb013b976e870de32d38b669a1437f8388bbda
Reviewed-on: http://review.whamcloud.com/8883
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Christopher J. Morrone <chris.morrone.llnl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>