I find that an out-of-the-box installation of OSSP uuid 1.6.0 installs

I find that an out-of-the-box installation of OSSP uuid 1.6.0 installs
itself as libuuid, not libossp-uuid which was the only case expected by
our build support.  Install a configure test to determine which name
to use (and to check that the library is present at all).