PATCH: IRIX fixincludes

[Bruce Korb]

>     >> I switched IRIX to ordinary fixincludes which fixed the
>     >> bootstrap.  Some 96 files got fixed, with `machine_name' being
>     >> the most common fix.

While I was checking in the fix for the theoretical problem,
I nuked fixinc.irix, too.

> Agreed.  I don't see the point in the special-purpose files.  We can
> always conditionalize the fixes themselves to operate only on certain
> systems, if that's what we really want.

Thats the design.  Conditionalize on whatever works best.... :-)