Fix wrapper ldflags.

cmr=v1.7.4:reviewer=jsquyres
Add missing header file
This fixes a long standing bug in the OpenIB BTL's MCA param intialization.Only caught if BTL_OPENIB_FAILOVER_ENABLED. Thanks to Jeff for spotting. This should be added to:

cmr=v1.7.4:reviewer=jsquyres
cmr=v1.6.6
Fix typo and portability issue in r30555

cmr=v1.7.4:ticket=#4223