Fix Linux compile error.

src/modules/audio/null/Source.h

@@ -107,7 +107,7 @@ private:
 	float maxVolume = 1.0f;
 	float referenceDistance = 1.0f;
 	float rolloffFactor = 1.0f;
-	float maxDistance = std::numeric_limits<float>::max();
+	float maxDistance = FLT_MAX;
 	float absorptionFactor = 0.0f;
 
 }; // Source