Put rs.single on initial ramdisk to prevent potential race when readclock terminates early

drivers/ramdisk/Makefile

@@ -2,7 +2,7 @@
 
 PROGRAMS=at_wini bios_wini cdprobe dev2name floppy loadramdisk newroot \
 	pci sh service sysenv mfs
-EXTRA=system.conf passwd
+EXTRA=system.conf passwd rs.single
 
 CPPFLAGS+= -I${MINIXSRCDIR}/servers
 MAKEDEV=/usr/bin/MAKEDEV
@@ -103,6 +103,9 @@ system.conf: ../../etc/system.conf
 passwd: ../../etc/passwd
 	install -s ../../etc/$@ $@
 
+rs.single: ../../etc/rs.single
+	install -s ../../etc/$@ $@
+
 proto.gen: $(MAKEDEV) proto.sh proto
 	sh -e proto.sh >proto.gen
 

drivers/ramdisk/proto

@@ -25,5 +25,6 @@ d--755 0 0
 		mtab ---644 0 0 mtab
 		passwd ---644 0 0 passwd
 		rc ---755 0 0 rc
+		rs.single ---755 0 0 rs.single
 	$
 $