winealsa: Add special case for microphone source in mixer

[Maarten Lankhorst]

Some microphones don't have a capture control, but a playback control
instead. So use the playback volume, but still register it as capture
volume.
---
 dlls/winealsa.drv/mixer.c |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)
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