Should we require autoconf 2.69?

[Roland McGrath]

> On Wed, Sep 17, 2014 at 12:33 PM, Roland McGrath <roland@hack.frob.com> wrote:
> > If you make sure the GLIBC_PROVIDES magic in aclocal.m4 is still right,
> > then it's fine with me.
> 
> What should I look for?  I didn't get any error messages with autoconf 2.69.

Basically you should regenerate all the sysdeps/.../configure files and
eyeball the diffs for sanity.  If any of them inflates a lot or anything
else bizarre-looking, then we have a problem.