Change BITS_IBackgroundCopyJob_SetPriority to a stub so the EvE-Online patcher works.

[Tim Wright]

The EvE-online updater blows up because it's trying to set the download 
priority in BITS (qmgr) and that isn't implemented. Simply stubbing it 
to return S_OK is sufficient to allow it to work.

Third attempt at sending. For some reason, it isn't being posted from 
git-send-email even though the Cc: arrives just fine at another account. 
Patch against git repository. This is bug 18528/12312.

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