Use isfinite from C instead of std::isfinite from C++

include/util/math.hpp

@@ -168,7 +168,7 @@ struct Vec {
 		return x == 0.0f && y == 0.0f;
 	}
 	bool isFinite() {
-		return std::isfinite(x) && std::isfinite(y);
+		return isfinite(x) && isfinite(y);
 	}
 	Vec clamp(Rect bound);
 };

src/app/Knob.cpp

@@ -19,7 +19,7 @@ void Knob::onDragStart(EventDragStart &e) {
 void Knob::onDragMove(EventDragMove &e) {
 	float range = maxValue - minValue;
 	float delta = KNOB_SENSITIVITY * -e.mouseRel.y * speed;
-	if (std::isfinite(range))
+	if (isfinite(range))
 		delta *= range;
 
 	// Drag slower if Mod is held

src/app/SVGKnob.cpp

@@ -24,7 +24,7 @@ void SVGKnob::step() {
 	if (dirty) {
 		tw->box.size = box.size;
 		float angle = 0.0;
-		if (std::isfinite(minValue) && std::isfinite(maxValue))
+		if (isfinite(minValue) && isfinite(maxValue))
 			angle = rescale(value, minValue, maxValue, minAngle, maxAngle);
 		tw->identity();
 		// Scale SVG to box