Windows: Capture the microphone through WASAPI instead of Media Foundation

Windows now uses the same host interface as SDL and iOS: sceUsbMic sends
startRecording/stopRecording/deviceChanged, and drains buffered input on
the CPU thread with pollRecording. A capture thread asks WASAPI for mono
16-bit at the game's rate (it converts from the mix format, so no more
ffmpeg resampling), and copies packets into a lock-free ring buffer.
It reopens the device when the selection changes, and retries once a
second if the device is missing or gets unplugged.

The device list comes from the active capture endpoints. Their friendly
names are the ones Media Foundation reported, so existing MicDevice
settings still match. An empty setting, now selectable as Auto like on
SDL, means the default capture device.

The Media Foundation audio capture code is removed; the camera still
uses it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

UI/NativeApp.cpp

@@ -947,7 +947,6 @@ bool NativeInitGraphics(GraphicsContext *graphicsContext) {
 #if defined(_WIN32) && !PPSSPP_PLATFORM(UWP)
 	if (IsWin7OrHigher()) {
 		winCamera = new WindowsCaptureDevice(CAPTUREDEVICE_TYPE::VIDEO);
-		winMic = new WindowsCaptureDevice(CAPTUREDEVICE_TYPE::AUDIO);
 	}
 #endif
 
@@ -1078,11 +1077,6 @@ void NativeShutdownGraphics(GraphicsContext *graphicsContext) {
 		delete winCamera;
 		winCamera = nullptr;
 	}
-	if (winMic) {
-		winMic->waitShutDown();
-		delete winMic;
-		winMic = nullptr;
-	}
 #endif
 
 #if PPSSPP_PLATFORM(IOS)