Remove unused functions.

miniaudio.h

@@ -4272,17 +4272,6 @@ static MA_INLINE float ma_mix_f32_fast(float x, float y, float a)
     /*return x + (y - x)*a;*/
 }
 
-static MA_INLINE ma_int32 ma_mix_s32_fast(ma_int32 x, ma_int32 y, float a)
-{
-    ma_int32 r0 = (y - x);
-    ma_int32 r1 = (ma_int32)(r0*a);
-    return x + r1;
-}
-
-static MA_INLINE ma_int16 ma_mix_s16_fast(ma_int32 x, ma_int32 y, float a)
-{
-    return (ma_int16)ma_mix_s32_fast(x, y, a);
-}
 
 #if defined(MA_SUPPORT_SSE2)
 static MA_INLINE __m128 ma_mix_f32_fast__sse2(__m128 x, __m128 y, __m128 a)