LIB_SUFFIX is no longer used. Replaced with LIB_INSTALL_DIR
which provides the correct lib dir with arch suffix.
Moved the call to include(GNUInstallDirs) prior to checking the
CMAKE_INSTALL_LIBDIR - which is set by include(GNUInstallDirs).
Tested with cmake 2.8 and cmake 3.5.
Signed-off-by: Noel Eck <noel.eck@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>