(_curl_action) kill unused parameter that could never have been used

rationale: an array must be the last variable in a prototype

bug introcuded in commit r258682 by cfergeau on 2009-07-30:
"dudf patch from Olivier Rosello for the Mancoosi project"

further not fixed in commit r258683 by cfergeau on 2009-07-30:
"slight clean-up in wget downloading handling"

dudf support was always broken...

interesting enough, this was spot by perl_checker but only when
checking all files at once, not when checking urpm/download.pm only

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