This change (and a little change for alpha gcc config) allowed me to build

cross tools and kernels with those cross tools on all archs except mvme88k
and hppa.

1. Pass MACHINE_ARCH, not MACHINE to TARGET_MACHINE_ARCH when building old
   binutils.
2. Instead of using the "intelligent" cpp voodoo to find out MACHINE_ARCH
   from MACHINE (which has never worked correctly for sparc, 68k and
   recently it broke for powerpc), we have a table of machine->machine_arch
   translations. It's easier to modify one table once per arch instead of
   juggling for a few hours every time some include files change.
3. Remove some sparc64 cruft.
4. Set MACHINE and MACHINE_ARCH in cross-env, otherwise the kernel will
   try to build libkern for the host.

Please note that this doesn't allow you to do complete builds. I haven't
even tested cross-lib. Only kernel builds have been tested.

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