Ignore blank characters at the end of ${pkg_scripts} in order

to refrain from trying to execute /etc/rc.d/ in that case.
Problem noticed by jasper@.
Opinions on this patch vary: "much nicer, ok" sthen@
"good god, what horrible shell voodoo, ok" ajacoutot@

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.420 2014/01/19 09:39:04 claudio Exp $
+#	$OpenBSD: rc,v 1.421 2014/02/19 21:47:15 schwarze Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -234,6 +234,7 @@ if [ X"$1" = X"shutdown" ]; then
 
 	# If we are in secure level 0, assume single user mode.
 	if [ `sysctl -n kern.securelevel` -ne 0 ]; then
+		pkg_scripts=${pkg_scripts%%*( )}
 		if [ -n "${pkg_scripts}" ]; then
 			echo -n 'stopping package daemons:'
 			while [ -n "${pkg_scripts}" ]; do