fix copymode

Reference: /n/atom/patch/applied/k10copymode
Date: Sun Aug 16 19:21:05 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/main.c	Sun Aug 16 19:20:56 2015
+++ /sys/src/nix/k10/main.c	Sun Aug 16 19:20:57 2015
@@ -161,6 +161,7 @@
 	if(getconf("*maxmach") != nil)
 		maxmach = atoi(getconf("*maxmach"));
 	mpsinit(maxmach);		/* acpi */
+	sys->copymode = 1;		/* assume > 1 processor; copy on reference */
 
 	umeminit();
 	trapinit();