Remove --disable-versioning

[Joseph S. Myers]

On Wed, 18 Sep 2013, Roland McGrath wrote:

> I know you've already committed this, but I'm very behind.  Just wanted to
> mention that the use cases for --disable-versioning are exactly the same
> ones as for --enable-oldest-abi, which we also removed because it was
> broken and nobody cared about the use cases enough to maintain it.

We haven't yet removed --enable-oldest-abi, but I agree we want to remove 
it (and have added its removal to the wiki todo list).

-- 
Joseph S. Myers
joseph@codesourcery.com