Part 3/3 of unbreaking cross releases:

When we call "distributeworld" as part of "make release", we set
MACHINE and MACHINE_ARCH to point to TARGET and TARGET_ARCH; this
confused src/Makefile's idea of what ${MAKEPATH}, and consequently
${MAKE}, is (well, it still confuses ${MAKEPATH}, but see below).

To overcome this problem, we now take the following approach:

- We preserve the make(1)'s idea of its argv[0], ${MAKE}.
- We check to see if ${MAKE} passes the regression tests.
- If it does, we use it.  Otherwise, we build and use an
  up-to-date make(1).

This fix is still not quite right, in a situation where a single
/usr/obj is shared between different architecture machines, but
it is less critical and I hope to fix that soon.

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