Remove sysdeps/mips/dec sysdeps/mips/mips3 sysdeps/mips/p40

[Andreas Jaeger]

The directories sysdeps/mips/dec sysdeps/mips/mips3 sysdeps/mips/p40
are only used for some old architecture with totally unsupported
OSes.  configure selects these supdirs with:

mips*)		base_machine=mips
		case "`uname -m`" in
		IP22) machine=mips/mips3 ;;
		*)    machine=mips/$machine ;;
		esac ;;

But under Linux we always get "mips" as result of "uname -m".  Hartvig
Ekner <hartvige@mips.com> suggested to remove this, Ralf Bächle agreed
to it - and I'm also convinced that we can get rid of these.

Ok to commit the patch that removes those subdirs and adjusts
configure for it?

Andreas
-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
    http://www.suse.de/~aj