[m-dev.] [m-users.] Closed source Mercury projects on Windows

[Mark Brown]

One more thing is that we currently have text at the start of each
file mentioning the LGPL, which we should also update. Any objections
to the following wording?

% This file is distributed under the terms of the GNU Library General
Public License,
% with the special exception on linking described in the file COPYING.LIB.

Mark