Some generated header files are messed up on Alpine

[Tim Rühsen]

Hi,

I just updated gnulib to commit 2671376bc and have build issues on 
Alpine (using docker; FROM alpine:latest).
Not saying this commit is faulty, I didn't update gnulib since April 2021.

Some generated header files look like

bash-5.1# head -3 lib/uniwidth.h
/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
 2001-2002, 2005, 2007, 2009-2021 Free Software Foundation,
   Inc.

This obviously won't compile.

Another example is:

bash-5.1# head -3 lib/unitypes.h
/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
niString library.
   Copyright (C) 2002, 2005-2006, 2009-2021 Free Software Foundation, Inc.

I tested with ./bootstrap from gnulib/build-aux/.
This issue does not appear on Debian Linux (stable, testing, unstable).

If this is not reproducible or the issue is not obvious, please let me 
know so that I can provide a Dockerfile (or docker image) plus 
instructions on how to reproduce.

Regards, Tim

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