Fix a few more bad asm issues on plan9.

    Mostly to do with insn naming and symbol visibility.
Fix gen9p.c's formatting.

    Had an extra arg.
Merge branch 'master' of git+ssh://git.eigenstate.org/git/ori/mc

Conflicts:
	6/gen.c
	6/locs.c
	6/simp.c
Get more of libstd ported to plan9.

    Move stuff into syswrap.myr.
Libstd now builds on plan9.

    It's missing a load of functions, of course, but it buillds.
Update posixy syswrap to match plan9 changes.