Some changes in the header so Godot3 compiles again on Windows.

core/math/math_funcs.cpp

@@ -27,12 +27,8 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 #include "math_funcs.h"
-
 #include "core/os/os.h"
 
-#include "float.h"
-#include "pcg.h"
-
 pcg32_random_t Math::default_pcg = {1, PCG_DEFAULT_INC_64};
 
 #define PHI 0x9e3779b9

core/math/math_funcs.h

@@ -33,9 +33,8 @@
 #include "math_defs.h"
 #include "pcg.h"
 
-#ifndef NO_MATH_H
 #include <math.h>
-#endif
+#include <float.h>
 	
 #define Math_PI 3.14159265358979323846
 #define Math_SQRT12 0.7071067811865475244008443621048490