Make ompi_mpi_java_eager MCA var show up in ompi_info

[jsquyres]

The Java bindings layer registers the ompi_mpi_java_eager MCA variable. However, this currently occurs at https://github.com/open-mpi/ompi/blob/main/ompi/mpi/java/c/mpi_MPI.c#L273-L278, which is invoked during the Java MPI binding MPI_init, and is located in libmpi_java.

Since ompi_info (rightfully) isn't linked against libmpi_java, that means that ompi_info won't see this MCA var registration, and therefore won't display it. It would be good to someday enable this MCA var to show up, but without introducing a dependency of libmpi to libmpi_java.

AFAIK, this issue has existed in all released versions of Open MPI with the Java bindings.