properly account for started application processors.

Reference: /n/atom/patch/applied2013/fsmpacct
Date: Wed Sep  4 18:36:50 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/amd64/squid.c	Wed Sep  4 18:36:43 2013
+++ /sys/src/fs/amd64/squid.c	Wed Sep  4 18:36:43 2013
@@ -15,6 +15,10 @@
 	m->cpuhz = sys->machptr[0]->cpuhz;
 	m->cpumhz = sys->machptr[0]->cpumhz;
 
+	ilock(&active);
+	active.machs |= 1<<m->machno;
+	iunlock(&active);
+
 	DBG("Hello Squidboy %d %d\n", apicno, m->machno);
 
 	vsvminit(MACHSTKSZ);