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Add constant to control number of Wii U buffers

--- a/src/Backends/Audio/WiiU-Software.cpp

+++ b/src/Backends/Audio/WiiU-Software.cpp

@@ -14,6 +14,8 @@

 #include "SoftwareMixer.h"

+#define AUDIO_BUFFERS 2	// Double-buffer

+

 #define MIN(a, b) ((a) < (b) ? (a) : (b))

 #define MAX(a, b) ((a) > (b) ? (a) : (b))

 #define CLAMP(x, y, z) MIN(MAX((x), (y)), (z))

@@ -163,11 +165,11 @@

 	if (stream_buffer_long != NULL)

 	{

-		stream_buffers[0] = (short*)malloc(buffer_length * sizeof(short) * 2);	// `* 2` because it's a double-buffer

+		stream_buffers[0] = (short*)malloc(buffer_length * sizeof(short) * AUDIO_BUFFERS);

 		if (stream_buffers[0] != NULL)

 		{

-			stream_buffers[1] = (short*)malloc(buffer_length * sizeof(short) * 2);	// `* 2` because it's a double-buffer

+			stream_buffers[1] = (short*)malloc(buffer_length * sizeof(short) * AUDIO_BUFFERS);

 			if (stream_buffers[1] != NULL)

 			{

@@ -203,7 +205,7 @@

 								.dataType = AX_VOICE_FORMAT_LPCM16,

 								.loopingEnabled = AX_VOICE_LOOP_ENABLED,

 								.loopOffset = 0,

-								.endOffset = (buffer_length * 2) - 1,	// -1 or else you'll get popping!

+								.endOffset = (buffer_length * AUDIO_BUFFERS) - 1,	// -1 or else you'll get popping!

 								.currentOffset = 0,

 								.data = stream_buffers[i]

 							};