[PATH 2/2] ddraw: COM cleanup for IDirectDrawSurface7 iface

[Ričardas Barkauskas]

Still my first try for COM cleanup. Please don't be too harsh :)
If this is too large for one patch, please suggest how to split it.

This is not automatic clean up so I don't really expect it to be good on
first try.

I'm not sure it is right to do what I did for CreateSurface in this
patch, but it did felt as an appropriate thing to do.

Tests pass. Few tried games still run.

Ričardas Barkauskas
REalm
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