Updated poly2tri library from https://github.com/jhasse/poly2tri

src/poly2tri/common/utils.h

@@ -1,6 +1,6 @@
 /*
- * Poly2Tri Copyright (c) 2009-2010, Poly2Tri Contributors
- * http://code.google.com/p/poly2tri/
+ * Poly2Tri Copyright (c) 2009-2018, Poly2Tri Contributors
+ * https://github.com/jhasse/poly2tri
  *
  * All rights reserved.
  *
@@ -34,11 +34,18 @@
 
 // Otherwise #defines like M_PI are undeclared under Visual Studio
 #ifndef _USE_MATH_DEFINES
-  #define _USE_MATH_DEFINES
+	#define _USE_MATH_DEFINES
 #endif /* _USE_MATH_DEFINES */
 
+#include "shapes.h"
+
+#include <cmath>
 #include <exception>
-#include <math.h>
+
+// C99 removes M_PI from math.h
+#ifndef M_PI
+#define M_PI 3.14159265358979323846264338327
+#endif
 
 namespace p2t {
 
@@ -121,4 +128,4 @@ bool InScanArea(const Point& pa, const Point& pb, const Point& pc, const Point&
 
 }
 
-#endif
+#endif