This module was contributed under a BSD-like license. We added CMake's
OSI-approved BSD License on top of it. With the author's permission,
this commit removes the old license text and puts the author's copyright
notice in the block referring to the new license.
This adds copyright/license notification blocks CMake's find-modules.
Many of the modules had no notices at all. Some had notices referring
to the BSD license already. This commit normalizes existing notices and
adds missing notices.