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kernel: add /rc to devroot

This makes it much easier to run a rc
program without needing to bind in all of '#s/boot'.

--- a/lib/namespace

+++ b/lib/namespace

@@ -22,6 +22,7 @@

 # standard bin

 bind /$cputype/bin /bin

+bind $rootdir'/rc' /rc

 bind -a /rc/bin /bin

 # internal networks

--- a/sys/man/3/root

+++ b/sys/man/3/root

@@ -10,6 +10,7 @@

 .B /net

 .B /net.alt

 .B /proc

+.B /rc

 .B /root

 .B /srv

 .fi

--- a/sys/src/9/boot/boot.c

+++ b/sys/src/9/boot/boot.c

@@ -25,6 +25,7 @@

 	buf[1+read(open("/env/cputype", OREAD|OCEXEC), buf+1, sizeof buf - 6)] = '\0';

 	strcat(buf, bin);

 	bind(buf, bin, MAFTER);

+	bind("/root/rc", "/rc", MREPL);

 	bind("/rc/bin", bin, MAFTER);

 	exec("/bin/bootrc", argv);

--- a/sys/src/9/port/devroot.c

+++ b/sys/src/9/port/devroot.c

@@ -105,6 +105,7 @@

 	addrootdir("net");

 	addrootdir("net.alt");

 	addrootdir("proc");

+	addrootdir("rc");

 	addrootdir("root");

 	addrootdir("srv");

 	addrootdir("shr");