CAudioOutputBuffer on Linux never read after Qt 6.10 update

[ltoenning]

After updating to Qt 6.10, QIODevice::readData is never called within CAudioOutputBuffer.

This has likely something to do with this workaround, previously only applied to Windows.

pilotclient/src/core/afv/audio/output.cpp

Lines 30 to 41 in 5f982a0

	#ifdef Q_OS_WIN
	qint64 CAudioOutputBuffer::bytesAvailable() const
	{
	// Workaround to mimic the pre-Qt6 behavior.
	// With Qt6, the QAudioSink on Windows uses the bytesAvailable function to trigger
	// a call to readData() only when data is available. Other platforms still use a
	// pull procedure that automatically calls readData() afer a specific period. Until
	// a proper solution for the bytesAvailable() is implemented, this uses a fixed number.
	// readData() will handle it itself if actually no data is available.
	return 3840 + QIODevice::bytesAvailable();
	}
	#endif

When using this function also on Linux, AFV audio output works as expected.

Either:

• Investigate what exactly has changed in QMultimedia and how it is supposed to trigger a readData() call.
• Also enable this function on Linux (quick and dirty fix)