ubik: Use libtool

ubik: Use libtool

Use libtool to build LWP and pthreaded versions of the ubik library.
Both versions are built in the src/ubik directory. src/tubik is modified
to only build pthreaded versions of the ubik test commands.

Replace use of libubik_pthread.a with the libtool generated library.

Change-Id: Id441fe00dbe801e38a108600bfbe06c292383872
Reviewed-on: http://gerrit.openafs.org/8090
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>