PATCH: Add x32 abilist files

[Roland McGrath]

> Here is a patch.  I added a special lib-names.awk for x86/x86-64 to
> handle it properly for x32, ia32 and x86-64.  Any comments?

Rather than a new pure special case, I think we should generalize the
generalization done for syscall-list-variants et al to be usable for
other {bi,...}arch file generation.  Then we can feed lib-names.awk
those same variables to have it do the general case of multi-alternatives.


Thanks,
Roland