[cmake,release] Explicitly list lib/include when using NO_DEFAULT_PATH.

When using NO_DEFAULT_PATH the lib and include subdirectories will
not be searched by default by find_path and pt-scotch will not be
found outside of the standard path. This commit adds them and now
locally installed versions may supersede the system ones.

(cherry picked from commit 0088d9d6)
Signed-off-by: Carsten Gräser <graeser@dune-project.org>