[PATCH] Allow to override Content-Length in wget

[ale5000]

The wget applet allows several common headers to be overridden by
the user.  Add 'Content-Length' to the list.  This is supported
by GNU wget.

Ping for this: https://lists.busybox.net/pipermail/busybox-cvs/2024-July/041863.html
Patch from Ron Yorston.
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