Okay, it's been about five days.  -current absolutely, positively, will
not build, because '/lib/csu/common_elf/common.h' uses __weak_extern and
there's no #define in scope.  The "obvious" fix doesn't work either.

It seems as though this is not affecting anyone else.  I have nuked my
entire tree and resupped, and I still get it.  Any ideas?

-s