add -t flag to mkcpuboot, to skip building nvram

Reference: /n/atom/patch/applied2013/cpuboott
Date: Mon Oct 14 01:11:45 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/disk/mkcpuboot	Mon Oct 14 01:11:25 2013
+++ /sys/src/cmd/disk/mkcpuboot	Mon Oct 14 01:11:25 2013
@@ -11,7 +11,7 @@
 	exit fail
 }
 
-flagfmt='l loader,p pbs,m mbr,k kernel'
+flagfmt='t,l loader,p pbs,m mbr,k kernel'
 args='drive'
 if(! ifs=() eval `{aux/getflags $*} || ! ~ $#* 1){
 	aux/usage
@@ -55,4 +55,6 @@
 	fail missing required 9fat files
 disk/format -b $pbs -d -r 2 $d/9fat \
 	9fat/^($bl plan9.ini $bk $extra) || fail
-nvram=$d/nvram auth/wrkey
+if(~ $#flagt 0)
+	nvram=$d/nvram auth/wrkey
+~ 1 1
--- /386/bin/disk/mkcpuboot	Mon Oct 14 01:11:25 2013
+++ /386/bin/disk/mkcpuboot	Mon Oct 14 01:11:25 2013
@@ -11,7 +11,7 @@
 	exit fail
 }
 
-flagfmt='l loader,p pbs,m mbr,k kernel'
+flagfmt='t,l loader,p pbs,m mbr,k kernel'
 args='drive'
 if(! ifs=() eval `{aux/getflags $*} || ! ~ $#* 1){
 	aux/usage
@@ -55,4 +55,6 @@
 	fail missing required 9fat files
 disk/format -b $pbs -d -r 2 $d/9fat \
 	9fat/^($bl plan9.ini $bk $extra) || fail
-nvram=$d/nvram auth/wrkey
+if(~ $#flagt 0)
+	nvram=$d/nvram auth/wrkey
+~ 1 1
--- /sys/man/8/mkcpuboot	Mon Oct 14 01:11:25 2013
+++ /sys/man/8/mkcpuboot	Mon Oct 14 01:11:25 2013
@@ -4,6 +4,8 @@
 .SH SYNOPSIS
 .B disk/mkcpuboot
 [
+.B -t
+][
 .B -m
 .I mbr
 ][
@@ -39,6 +41,12 @@
 .BR /386/9load ,
 .BR /amd64/9cpu ,
 respectively.
+The
+.B -t
+flag skips building
+.SM NVRAM
+(see
+.IR auth (8)).
 .SH EXAMPLE
 To prepare a bootable kernel using the defaults on
 .BR /dev/sdE0 ,
@@ -62,7 +70,7 @@
 .IR authsrv (2),
 .IR auth (8),
 .IR booting (8),
-.IR pcipl (8)
+.IR iplpc (8)
 .SH BUGS
 Using fat is dubious.
 .I Iplpc