msi: Download the MSI package if it is a remote URL

[Dan Kegel]

Your patch ends in an empty sig, i.e. two dashes,
which makes patch complain "patch ends in middle of a line"
after finishing.

I tried your patch to see if it fixed a similar problem in Ability Office
(see http://ability.com/v4/download.php )
but sadly that still fails with

fixme:urlmon:URLDownloadToCacheFileW ((nil)
L"http://www.abilitydownload.com/download4/ability4_15/Ability.MSI"
0x7fd49f40 520 0 0x7fb9fae8)


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