PATCH: Add x32 abilist files

[Roland McGrath]

> Here is the patch with the shlib-versions changes.  OK to install?
> Tested on Linux/x86-64.

You didn't add comments to the new files as I asked.
Please do that.

I'm not sure there is really any need to leave behind those new comments in
the top-level shlib-versions file.  I think we will eventually move to
having all the per-machine lines in sysdeps files, so x86_64 is not really
special in this regard.

The DEFAULT lines in the new files have the wrong spacing (too many spaces
where there should be just a tab).  The existing shlib-versions file has
(the right number of) spaces where there should be a tab, but that's no
reason to propagate the error to the new files.


Thanks,
Roland