Make internal BLAS/LAPACK messages less noisy

BLAS and LAPACK are close to insignificant to Gromacs, so
avoid multi-line noisy warnings about "fallback" solutions;
those will just worry users and make them spend time investigating
under what conditions it might play a role, when we really don't
care much for BLAS/LAPACK performance. Message has been
changed to short inconspicuous status lines when we are using
built-in versions.

Change-Id: I9f1b0c769907521d5cb6325c8d67cd61ca8a803a