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bootrc: fix $rootdir and $rootspec handling (thanks lucio)

we did not interpret the $rootdir and $rootspec environment
variables right. $rootdir is what gets bound to / (usually /root)
and $rootspec is the mountspec of /root.

--- a/sys/src/9/boot/bootrc

+++ b/sys/src/9/boot/bootrc

@@ -130,7 +130,7 @@

 	# mount root filesystem

 	if(~ $#rootdir 0)

 		rootdir=/root

-	must mount -c /srv/boot $rootdir

+	must mount -c '#s/boot' /root $rootspec

 	# compile init command

 	if(~ $#init 0){

@@ -151,7 +151,7 @@

 	# create the name space, mount the root fs

 	/mnt/broot/$cputype/bin/bind / /

-	/mnt/broot/$cputype/bin/mount -ac '#s/boot' /

+	/mnt/broot/$cputype/bin/bind -ac $rootdir /

 	# remove the remaining temporary root

 	/mnt/broot/$cputype/bin/unmount /mnt/broot

-- 

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