Add shebang to make it clear these files are shell scripts (they are

explicitely executed by sh(1)).
discussed with deraadt@

src/etc/examples/rc.local

@@ -1,6 +1,9 @@
-#	$OpenBSD: rc.local,v 1.2 2014/07/14 09:42:50 ajacoutot Exp $
+#!/bin/sh
+#
+# $OpenBSD: rc.local,v 1.3 2014/07/14 10:15:33 ajacoutot Exp $
 #
 # Site-specific startup actions, daemons, and other things which
 # can be done AFTER your system goes into securemode.  For actions
 # which should be done BEFORE your system has gone into securemode
 # please see /etc/rc.securelevel.
+#

src/etc/examples/rc.securelevel

@@ -1,6 +1,9 @@
-#	$OpenBSD: rc.securelevel,v 1.2 2014/07/14 09:42:27 ajacoutot Exp $
+#!/bin/sh
+#
+# $OpenBSD: rc.securelevel,v 1.3 2014/07/14 10:15:33 ajacoutot Exp $
 #
 # site-specific startup actions, daemons, and other things which
 # can be done BEFORE your system goes into securemode.  For actions
 # which should be done AFTER your system has gone into securemode
-# please see /etc/rc.local
+# please see /etc/rc.local.
+#

src/etc/examples/rc.shutdown

@@ -1,5 +1,8 @@
-#	$OpenBSD: rc.shutdown,v 1.2 2014/07/14 09:42:50 ajacoutot Exp $
+#!/bin/sh
+#
+# $OpenBSD: rc.shutdown,v 1.3 2014/07/14 10:15:33 ajacoutot Exp $
 #
 # If it exists, this script is run at system-shutdown by reboot(8),
 # halt(8).  If the architecture supports keyboard requested halting,
 # it is also run by init(8) when such an event happens.
+#