Change MAKEDEV so that it prepends /sbin:/bin to $PATH instead of totally

overwriting $PATH, and find mknod $PATH instead of hardcoding /sbin so
that the copy of MAKEDEV on the fixit floppy is usable, since mknod and
expr live in /mnt2/stand when the fixit floppy is running.

Get rid of the sed invokation in release/Makefile that attempts to
delete the PATH setting stuff from MAKEDEV on the fixit floppy.  This
hasn't worked since a long ago change to MAKEDEV caused the sed
expression to no longer match.

PR:		misc/21241

etc/MAKEDEV

@@ -150,7 +150,7 @@
 if [ -n "$MAKEDEVPATH" ]; then
 	PATH="$MAKEDEVPATH"
 else
-	PATH=/sbin:/bin
+	PATH=/sbin:/bin:$PATH
 fi
 umask 77
 
@@ -190,11 +190,18 @@ dkminor()
 }
 
 # Override mknod(2) to add extra handling to it.
+mknod=/sbin/mknod
+for i in `IFS=':'; echo $PATH`; do
+	if [ -x "${i}/mknod" ]; then
+		mknod="${i}/mknod"
+		break
+	fi
+done
 mknod() {
 	rm -f "$1" || exit 1
 	case $# in
-	4) /sbin/mknod "$@" root:wheel || die 2 "/sbin/mknod $@ failed";;
-	5) /sbin/mknod "$@"            || die 2 "/sbin/mknod $@ failed";;
+	4) "$mknod" "$@" root:wheel || die 2 "$mknod $@ failed";;
+	5) "$mknod" "$@"            || die 2 "$mknod $@ failed";;
 	*) die 2 "bad node: mknod $@";;
 	esac
 }

release/Makefile

@@ -604,7 +604,7 @@ release.9:
 	@cd ${.CURDIR} && $(MAKE) installCRUNCH CRUNCH=fixit \
 		DIR=${RD}/fixitfd/stand ZIP=false
 	@( cd ${RD}/fixitfd/dev && \
-		sed -e '/^PATH/s/^/#/' ${RD}/trees/bin/dev/MAKEDEV > MAKEDEV && \
+		cp ${RD}/trees/bin/dev/MAKEDEV MAKEDEV && \
 		chmod 755 MAKEDEV && \
 		sh MAKEDEV fixit )
 	@cp ${RD}/trees/bin/etc/spwd.db ${RD}/trees/bin/etc/group \