[PATCH 1/4] configure: Use autoconf 2.71

[Joseph Myers]

On Thu, 29 Jun 2023, Siddhesh Poyarekar via Libc-alpha wrote:

> Actually, before I do this, the files are most likely going to change because
> autoconf 2.71 gets rid of the (AFAICT Solaris-specific) hack $as_echo and some
> other stuff, so there's a bunch of non-interesting changes.  May I assume we
> want to make these changes anyway since we specifically mention 2.71 as the
> supported autoconf?

My assumption is that changes from regeneration are desired - *but* if 
those changes result in extra function definitions appearing in those 
fragments, and those functions are actually defined in configure before 
the fragments are read, then the GLIBC_PROVIDES definition in aclocal.m4 
may need updating.  (It's possible there are existing function definitions 
in some of the fragments that should actually be dealt with that way as 
well.)

-- 
Joseph S. Myers
joseph@codesourcery.com