wget --config=/dev/null would ignore ALL local settings,
but interfers maybe too much - proxy auth for example.
So adjust only some settings.

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M  download

Change-Id: I3dad22c4a4e18a480a7157ad3cc903c6a0725a4e
Reviewed-on: https://gerrit.libreoffice.org/1046Reviewed-by: Tor Lillqvist <tml@iki.fi>
Tested-by: Tor Lillqvist <tml@iki.fi>