Bug#272867: [Bug-gnulib] missing licenses in gnulib

[Paul Eggert <eggert@CS.UCLA.EDU>]

Bruno Haible <bruno@clisp.org> writes:

> For the m4 files, I propose to add the standard notice to them:
>
> dnl Copyright (C) YEARS Free Software Foundation, Inc.
> dnl This file is free software, distributed under the terms of the GNU
> dnl General Public License.  As a special exception to the GNU General
> dnl Public License, this file may be distributed as part of a program
> dnl that contains a configuration script generated by Autoconf, under
> dnl the same distribution terms as the rest of that program.

For GPL'ed modules, I'd rather just use the GPL, as it's simpler and
clearer.  I don't see the point of having a special exception for the
m4 files if the underlying code is GPLed.

For LGPL'ed modules the situation is a bit murkier, and the above
notice would be fine with me.