Petr Menšík b491a82f56 Change exception SPDX to Autoconf-exception-generic ...

License text is in fact Autoconf generic exception, with already defined
SPDX identificator. Use that instead.

https://spdx.org/licenses/Autoconf-exception-generic.html
(cherry picked from commit 2b348a5daa)

2024-04-24 09:52:19 +00:00

..

Apache-2.0.txt

…

Autoconf-exception-3.0.txt

…

Autoconf-exception-generic.txt

…

BSD-2-Clause.txt

…

BSD-3-Clause.txt

…

CC0-1.0.txt

…

FSFAP.txt

…

GPL-2.0-or-later.txt

…

GPL-3.0-or-later.txt

…

ISC.txt

…

LLVM-exception.txt

…

MIT.txt

…

MPL-2.0.txt

…