After fixing numerous bugs (varargs lossage, ld.elf_so lossage, yadda
yadda), I have managed to build an apparently working
dynamically-linked sparc64 userland.  I'll be uploading a snapshot of
this shortly.


As part of this development, there will be a FLAG DAY for the sparc64
port.  In order to comply with the ELF ABI, it is necessary to change
the way argc is passed to user-level programs.  Executables compiled
from the sources in -current right now (with the ld.elf_so and crt0
changes I checked in today) will continue to work `forever'.  Old
executables will continue to work with a new kernel for a BRIEF time,
and then will be broken.

This is not expected to cause many problems, as the sparc64 port has
not been widely deployed at this point.