wget does not overwrite

[Kim B. Heino]

This is my third and hopefully last patch for today.

A long time ago I reported a problem that BusyBox's "wget -O" does not 
overwrite files as normal wget does:

http://busybox.net/lists/busybox/2007-April/027228.html

Here's a patch for "-O" to overwrite existing files.
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