some vendors default to RPATH, others to RUNPATH. The former does not allow override
with LD_LIBRARY_PATH when running binaries such as test suite and it was causing
problems on platforms where RPATH is default, by running the test suite against
the wrong library (out-of-tree vs in-tree).
This change has no effect on libqb itself, but only on the binaries.
Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>