Fix CUDA registration where we run out of memory being allocated.
This fixes the oshmem build bug identified by Orion Poplawski where shmem 
wrapper-data incorrectly adds @OMPI_WRAPPER_EXTRA_LIBS@. This fixes #4796 and should be
added to: 

cmr=v1.8.2:reviewer=jsquyres
shmem: include the rest of the patch -- update comments

Update the comments to be correct.

cmr=v1.8.2:ticket=#4808