Linux: Better ALSA support

This removes some bad behaviour, like the audio thread busy waiting inside ALSA code,
missing begins of voice samples(due to DSP_HLE code not getting called often enough).
Turns out my understanding of ALSA API was lacking.

Tested with pulse plugin and directly on my intel-hda/realtek hardware.



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5461 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/AudioCommon/Src/AlsaSoundStream.h

@@ -59,6 +59,7 @@ private:
 	volatile int thread_data;
 
 	snd_pcm_t *handle;
+	int frames_to_deliver;
 #else
 public:
 	AlsaSound(CMixer *mixer) : SoundStream(mixer) {}