Add script to build many glibc configurations

[Carlos O'Donell]

On 11/11/2016 10:20 AM, Joseph Myers wrote:
> Here is an updated version of this script with some support for updating 
> existing checkouts.
> 
> Add script to build many glibc configurations.

> 2016-11-11  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* scripts/build-many-glibcs.py: New file.
> 

This looks great, and much better than what we have. If we do anything
else it should start with this script as the basis for discussion.

Please feel free to check this in.

-- 
Cheers,
Carlos.