[COMMDLG] Use Interlocked* functions in AddRef and Release

[Paul Vriens]

Hi,

the next in line. Still 30 dll's to go.

Wherever possible (if any), I changed the TRACE's not to contain
This->*ref* (without changing the text-part).

Changelog:
- use Interlocked* functions in AddRef and Release.
- store the result of the Interlocked functions and use only this.

Cheers,

Paul Vriens
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