Use rc to start ramfs before execing acme, since the procexec method
didn't work.

Rc could just as well be pointed at an external shell script to
further configure the environment without recompiling.

Reference: /n/atom/patch/applied/websocket-rcramfs
Date: Tue Mar  4 14:14:08 CET 2014
Signed-off-by: root@davidrhoskin.com

--- /sys/src/cmd/ip/httpd/websocket.c	Tue Mar  4 14:14:08 2014
+++ /sys/src/cmd/ip/httpd/websocket.c	Tue Mar  4 14:14:08 2014
@@ -383,20 +383,11 @@
 }
 
 void
-ramfsproc(void *arg)
-{
-	Channel *c = (Channel *)arg;
-
-	procexecl(c, "/bin/ramfs", nil);
-}
-
-void
 mountproc(void *arg)
 {
 	Procio *pio;
 	int fd, i;
 	char **argv;
-	Channel *c;
 
 	pio = (Procio *)arg;
 	fd = pio->fd;
@@ -409,11 +400,6 @@
 
 	newns("none", nil);
 
-	c = chancreate(sizeof(ulong), 0);
-
-	proccreate(ramfsproc, c, STACKSZ);
-	recv(c, nil);
-
 	if(mount(fd, -1, "/dev/", MBEFORE, "") == -1)
 		sysfatal("mount failed: %r");
 
@@ -505,7 +491,7 @@
 	};
 	Procio fromws, tows, frompipe, topipe;
 	Procio mountp, echop;
-	char *argv[] = {"/bin/acme", nil};
+	char *argv[] = {"/bin/rc", "-c", "ramfs; exec acme", nil};
 
 	fromws.c = chancreate(sizeof(Wspkt), CHANBUF);
 	tows.c = chancreate(sizeof(Wspkt), CHANBUF);