Patch: top level config (AIX)

[DJ Delorie]

> (config)
> 	* mt-aix43: Remove.

Could we postpone this removal until we verify that this works on real
AIX machines?  Undoing a removal is less trivial than undoing a patch.

> (top level)
> 	* configure: Add support for extra required flags for ar or nm.
> 	* configure.in (aix4.3+): Use above support for target-specific 
> 	issues, rather than using config/mt-aix43

This is OK.