[6/11] wineesd.drv: Let the EsounD server adjust the volume.
Previous message: [5/11] wineesd.drv: Build a unique name so we can identify our stream.
Next message: [7/11] wineesd.drv: Simplify wodPlayer_WriteMaxFrags() and	wodPlayer_FeedDSP().
This simplifies our code and avoids data copying.
Also, now wodGetVolume() returns the real EsounD volume, even if it has been modified by an external mixer (e.g. esdctl).
Uses the unique name added in the previous patch.
+     * be non-zero if set.