Require GCC 4.3 or later to build glibc

[Roland McGrath]

> * When I checked in a change with such an entry, it was shortly thereafter 
> followed by:
> 
> commit 6c1eace5df647ea85c7472c3fb314665abb22ec1
> Author: Ulrich Drepper <drepper@gmail.com>
> Date:   Mon Jan 30 22:50:20 2012 -0500
> 
>     Don't add CL for generated files!!!

There was no discussion about changing the well-established convention.
I don't think it should change, unless we do some form of automation that
ensures that you can never get a commit in without having the regeneration
done implicitly.


Thanks,
Roland