sci-libs/trilinos: Fix project config directory; version bump

This commit fixes the installation path for the Trilinos project
configuration so that it now resides under $(get_libdir)/cmake instead of
$(get_libdir)/trilinos/cmake.

Furthermore, a version bump to 11.4.2
Merge pull request #138 from tamiko/bump_trilinos

sci-libs/trilinos: Fix project config directory; version bump