Support for alpha-osf, mips-irix

[Alan Modra]

On Thu, Jul 09, 2020 at 04:21:54PM +0200, Rainer Orth wrote:
> Every once in a while I come across references to Tru64 UNIX
> (alpha*-dec-osf*)

If you'd like to remove this config triple I think you could go ahead,
but it doesn't buy us much really unless alpha-linuxecoff is also
removed.  I'm unsure as to how much use alpha-linuxecoff gets these
days.  Probably not much.  It looks like it was removed from gcc in
2002.

-- 
Alan Modra
Australia Development Lab, IBM