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lib9p: restore previous behaviour of fd group sharing

it appears that too many fileservers rely on the fileserver
process sharing the filedescriptors with children of the
caller to postmntsrv() or threadpostmntsrv().

restoring previous behaviour for now.

--- a/sys/src/lib9p/post.c

+++ b/sys/src/lib9p/post.c

@@ -23,8 +23,11 @@

 	if(_forker == nil)

 		sysfatal("no forker");

-	_forker(postproc, s, RFNAMEG|RFFDG|RFNOTEG);

+	_forker(postproc, s, RFNAMEG|RFNOTEG);

+	rfork(RFFDG);

+	rendezvous(0, 0);

+

 	close(s->infd);

 	if(s->infd != s->outfd)

 		close(s->outfd);

@@ -52,8 +55,11 @@

 	if(_forker == nil)

 		sysfatal("no forker");

-	_forker(postproc, s, RFNAMEG|RFFDG|RFNOTEG);

+	_forker(postproc, s, RFNAMEG|RFNOTEG);

+	rfork(RFFDG);

+	rendezvous(0, 0);

+

 	close(s->infd);

 	if(s->infd != s->outfd)

 		close(s->outfd);

@@ -72,6 +78,7 @@

 	Srv *s;

 	s = v;

+	rendezvous(0, 0);

 	close(s->srvfd);

 	srv(s);

 }