Copyright header for localedata files contributed under DCO

[Florian Weimer]

The localedata files currently contain this:

% This file is part of the GNU C Library and contains locale data.
% The Free Software Foundation does not claim any copyright interest
% in the locale data contained in this file.  The foregoing does not
% affect the license of the GNU C Library as a whole.  It does not
% exempt you from the conditions of the license if your use would
% otherwise be governed by that license.

I think the wording is less than satisfying because it's unclear whether
the patch submitter (or someone else) retains any copyright claims to
the file.  With localedata patches submitted under the DCO, this becomes
even more confusing.

Therefore, I proposed to

comment_char %
escape_char /

% Copyright The GNU Toolchain Authors.
% This file is part of the GNU C Library.
% 
% The GNU C Library is free software; you can redistribute it and/or
% modify it under the terms of the GNU Lesser General Public
% License as published by the Free Software Foundation; either
% version 2.1 of the License, or (at your option) any later version.
% 
% The GNU C Library is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
% Lesser General Public License for more details.
% 
% You should have received a copy of the GNU Lesser General Public
% License along with the GNU C Library; if not, see
% <https://www.gnu.org/licenses/>.


The main reason is to keep the contribution process simple.  For
example, we do not need to argue with the submitter whether they
actually can disclaim copyright or database protection rights.

Since the FSF disclaims copyright, we can also apply this header to
mixed FSF/DCO files once the need arises.

Thanks,
Florian