busybox:
 * accept only {{{wget}}} and {{{wget-busybox}}} as valid wget aliases
 * fixes busybox wget accepts wget-gnu as its alias, bug inroduced in r11633
 * refs #2237


git-svn-id: file:///var/svn/freetz/trunk@11635 149334a1-2f27-0410-a3b9-fc62619ac1e6