Replace math.h with cmath

src/win32-math.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 27 matching lines @@
 #endif  // _MSC_VER
 
 enum {
   FP_NAN,
   FP_INFINITE,
   FP_ZERO,
   FP_SUBNORMAL,
   FP_NORMAL
 };
 
-namespace v8 {
+
+namespace std {
 
 int isfinite(double x);
-
-}  // namespace v8
-
+int isinf(double x);
 int isnan(double x);
-int isinf(double x);
 int isless(double x, double y);
 int isgreater(double x, double y);
 int fpclassify(double x);
 int signbit(double x);
 
+}  // namespace std
+
 #endif  // V8_WIN32_MATH_H_