Fixes Windows 7 crashes when destroying DirectSound.#985

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fokede wants to merge 2 commits intowang-bin:masterfrom

Commits on Oct 24, 2017

Fixes DirectSound crash on Windows 7. When the player is destroyed, PositionWatcher tried to access already destroyed AudioOutputDSound object.
fokede
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Commits on Nov 1, 2017

Fixed crash with thread still waiting.
fokede
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