This fixes the hang mentioned in https://bugs.winehq.org/show_bug.cgi?id=57632 introduced by e6b8e9ee20937f12dbf19145a9f2ca1ca3364da3. That bug also mentions the radio being silent, that's unrelated to the hang should probably be a separate bug.
-- v2: quartz/dsoundrender: Restart the render thread when clearing EOS in dsound_render_sink_end_flush().