make sure to set tos->machno in all 9 kernels

Reference: /n/atom/patch/applied2013/tosmachno
Date: Sat Jun 15 03:25:04 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/pc/trap.c	Sat Jun 15 03:24:41 2013
+++ /sys/src/9/pc/trap.c	Sat Jun 15 03:24:42 2013
@@ -310,6 +310,7 @@
 	tos->kcycles += t - up->kentry;
 	tos->pcycles = up->pcycles;
 	tos->pid = up->pid;
+	tos->machno = m->machno;
 }
 
 /*
--- /sys/src/9/ppc/trap.c	Sat Jun 15 03:24:43 2013
+++ /sys/src/9/ppc/trap.c	Sat Jun 15 03:24:44 2013
@@ -152,6 +152,7 @@
 	tos->kcycles += t - up->kentry;
 	tos->pcycles = up->pcycles;
 	tos->pid = up->pid;
+	tos->machno = m->machno;
 }
 
 void
--- /sys/src/9/pcpae/trap.c	Sat Jun 15 03:24:46 2013
+++ /sys/src/9/pcpae/trap.c	Sat Jun 15 03:24:47 2013
@@ -310,6 +310,7 @@
 	tos->kcycles += t - up->kentry;
 	tos->pcycles = up->pcycles;
 	tos->pid = up->pid;
+	tos->machno = m->machno;
 }
 
 /*