[c] Fixed _isNan. VC++ evaluates 0/0 at compile time and errors out with C2124 as the constant is a division by zero.

spine-c/spine-c/src/spine/PathConstraint.c

@@ -198,8 +198,9 @@ static void _addAfterPosition (float p, float* temp, int i, float* out, int o) {
 	out[o + 2] = r;
 }
 
-static int _isNan(float value) {
-	float _nan =  (float)0.0/(float)0.0;
+// Need to pass 0 as an argument, so VC++ doesn't error with C2124
+static int _isNan(float value, float zero) {
+	float _nan =  (float)0.0 / zero;
 	return 0 == memcmp((void*)&value, (void*)&_nan, sizeof(value));
 }
 
@@ -208,7 +209,7 @@ static void _addCurvePosition (float p, float x1, float y1, float cx1, float cy1
 	float tt, ttt, u, uu, uuu;
 	float ut, ut3, uut3, utt3;
 	float x, y;
-	if (p == 0 || _isNan(p)) p = 0.0001f;
+	if (p == 0 || _isNan(p, 0)) p = 0.0001f;
 	tt = p * p, ttt = tt * p, u = 1 - p, uu = u * u, uuu = uu * u;
 	ut = u * p, ut3 = ut * 3, uut3 = u * ut3, utt3 = ut3 * p;
 	x = x1 * uuu + cx1 * uut3 + cx2 * utt3 + x2 * ttt, y = y1 * uuu + cy1 * uut3 + cy2 * utt3 + y2 * ttt;