dbus-test: fix ptest failed problem when multilib is enabled
Fix some failed info like:
| ./test/test-bus: relocation error: ./test/test-bus: symbol
| _dbus_threads_init_debug, version LIBDBUS_PRIVATE_1.10.10 not defined
| in file libdbus-1.so.3 with link time reference
| FAIL: test/test-bus
In run-ptest, LD_LIBRARY_PATH is set to /usr/lib, but when multilib
is enabled, /usr/lib64 will be used. fix by replace with correct path.
Signed-off-by: Changqing Li <changqing.li@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>