Allow file: protocol to download Mozilla ActiveX control

[Vincent Béron]

To be applied after shdocvw-tempfile.

URLDownloadToFile doesn't handle file:/// as protocol yet. Work around
that for now (so people can get the control by other means and still
have it automatically run, like for example through a binary package).

URLDownloadToFile should be fixed long term, but I don't think I'd be
able to do it right now (there are some Http... apis in it, so I guess
it only supports http: protocol for now).

Note that the Mozilla ActiveX control is still unusable out of the box
as it requires msvcp60.dll to be present, for which there's no builtin
version, and is not included in the control's installer.

Changelog:
Allow file:/// protocol to be used to download the Mozilla ActiveX
control.

Vincent
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