cron: Add path

Override PATH for /etc/init.d/cron. This is necessary to ensure all programs
can be found when executing the script from remote by using ssh.
(e.g. ssh IP /etc/init.d/cron restart)

Patch from: kentarou matsuyama <matsuyama@thinktube.com>

SVN-Revision: 25196

package/busybox/files/cron

@@ -2,6 +2,8 @@
 # Copyright (C) 2006 OpenWrt.org
 START=50
 
+PATH="/bin:/sbin:/usr/bin:/usr/sbin"
+
 start () {
 	loglevel=$(uci_get "system.@system[0].cronloglevel")
 	[ -z "$(ls /etc/crontabs/)" ] && exit 1