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Change the sound buffer size to a power of 2

Turns out giving SDL2 a non-power-of-2 buffer size crashes it in
Emscripten.

--- a/src/Sound.cpp

+++ b/src/Sound.cpp

@@ -16,9 +16,9 @@

 #define FREQUENCY 44100

 #ifdef RASPBERRY_PI

-#define STREAM_SIZE 0x400

+#define STREAM_SIZE 0x400	// Larger buffer to prevent stutter

 #else

-#define STREAM_SIZE (FREQUENCY / 200)

+#define STREAM_SIZE 0x100	// FREQUENCY/200 rounded to the nearest power of 2 (SDL2 *needs* a power-of-2 buffer size)

 #endif

 #define clamp(x, y, z) (((x) > (z)) ? (z) : ((x) < (y)) ? (y) : (x))