Fighting the good fight.

Move libfmt, libutf into subdirectories of lib9.

Add poll-based socket i/o to libthread, so that we can
avoid using multiple procs when possible, thus removing
dependence on crappy pthreads implementations.

Convert samterm, acme to the single-proc libthread.

Bring libcomplete, acme up-to-date w.r.t. Plan 9 distribution.

src/libthread/mkfile

@@ -12,6 +12,7 @@ OFILES=\
 	debug.$O\
 	exec-unix.$O\
 	exit.$O\
+	fdwait.$O\
 	getpid.$O\
 	id.$O\
 	iocall.$O\
@@ -30,6 +31,7 @@ OFILES=\
 	memsetd.$O\
 	note.$O\
 	proctab.$O\
+	read9pmsg.$O\
 	ref.$O\
 	rendez.$O\
 	sched.$O\