Check for file from real_init=FILE rather than /sbin/init (bug #437080)

ChangeLog

@@ -5,6 +5,10 @@
 # Distributed under the GPL v2
 # $Id$
 
+  03 Oct 2012; Dustin Frisch <dustin.frisch@gmail.com> defaults/linuxrc:
+  With boot parameter real_init=/foo look for ${NEW_ROOT}/foo, not
+  ${NEW_ROOT}/sbin/init (bug #437080)
+
   23 Sep 2012; Sebastian Pipping <sping@gentoo.org> gen_initramfs.sh:
   Append e2fsck and mke2fs to initramfs. Original patch by Rick Farina
 

defaults/linuxrc

@@ -623,7 +623,7 @@ do
 		# else not a good root and start over.
 		if [ "$?" = '0' ]
 		then
-			if [ -d ${NEW_ROOT}/dev -a -x ${NEW_ROOT}/sbin/init ] || [ "${REAL_ROOT}" = "/dev/nfs" ]
+			if [ -d ${NEW_ROOT}/dev -a -x "${NEW_ROOT}${REAL_INIT:-/sbin/init}" ] || [ "${REAL_ROOT}" = "/dev/nfs" ]
 			then
 				break
 			else