Upper NBROKEN to 8 to avoid lossing broken procs in long-running cpu servers.

Notes:
Wed Mar 29 17:37:57 EST 2006 rsc
    This is an arbitrary choice.  Why not 16?  
    If you want to make it different in your own systems go ahead,
    but I don't see the point here.
    
    The default is fine as it is.
    


Reference: /n/sources/patch/sorry/nbroken-8
Date: Wed Mar 29 13:18:40 CES 2006
Signed-off-by: uriel@cat-v.org
Reviewed-by: rsc

--- /sys/src/9/port/proc.c	Wed Mar 29 13:17:09 2006
+++ /sys/src/9/port/proc.c	Wed Mar 29 13:17:04 2006
@@ -963,7 +963,7 @@
 /*
  * weird thing: keep at most NBROKEN around
  */
-#define	NBROKEN 4
+#define	NBROKEN 8
 struct
 {
 	QLock;