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Used fmodf instead of fmod for a 0.5% performance increase in MixSounds

Signed-off-by: Gabriel Ravier <gabrielravier@gabrielAncientIBMv2>

--- a/src/Backends/Audio/SDL2.cpp

+++ b/src/Backends/Audio/SDL2.cpp

@@ -85,7 +85,7 @@

 				const float sample2 = (sound->samples[(size_t)sound->position + 1] - 128.0f) / 128.0f;

 				// Perform linear interpolation

-				const float interpolated_sample = sample1 + ((sample2 - sample1) * (float)fmod(sound->position, 1.0));

+				const float interpolated_sample = sample1 + ((sample2 - sample1) * fmodf(sound->position, 1.0));

 				*steam_pointer++ += interpolated_sample * sound->volume_l;

 				*steam_pointer++ += interpolated_sample * sound->volume_r;

@@ -96,7 +96,7 @@

 				{

 					if (sound->looping)

 					{

-						sound->position = fmod(sound->position, (double)sound->frames);

+						sound->position = fmodf(sound->position, sound->frames);

 					}

 					else

 					{

-- 

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