build: fix build to handle non-standard installation directories

This patch handles non standard installation directories for
Lustre, Mooshika and IB libraries (librdmacm, libverbs), with the
following new variables:
- LUSTRE_PREFIX
- MOOSHIKA_PREFIX
- LIBRDMACM_PREFIX
- LIBIBVERBS_PREFIX

Signed-off-by: Gregoire Pichon <gregoire.pichon@bull.net>
Signed-off-by: Philippe DENIEL <philippe.deniel@cea.fr>