Finish deorbiting libjuafs.a

Change I2074d5bc26e326db36b16e055431818ef1c69210 removed the separate
compilation/link of a libjuafs.a (since it was functionally identical
to the libuafs.a already being built), but retained a libjuafs.a in
TOP_LIBDIR for use by src/JAVA/libjafs/.

This commit adjusts src/JAVA/libjafs to refer to libuafs.a directly,
and removes references to libjuafs.a which are no longer relevant.

Change-Id: I0d02ea9e4be773ac50a04925c45e5f243650e21a
Reviewed-on: http://gerrit.openafs.org/11526
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: D Brashear <shadow@your-file-system.com>