Replace math.h with cmath

src/win32-math.h

Index: src/win32-math.h
diff --git a/src/win32-math.h b/src/win32-math.h
index 68759990b4307b5f40f0b528afbddfe5cea6c43b..0397c7e14eac0f1dcf009ba7ab470ed66889c61c 100644
--- a/src/win32-math.h
+++ b/src/win32-math.h
@@ -45,17 +45,17 @@ enum {
   FP_NORMAL
 };
 
-namespace v8 {
 
-int isfinite(double x);
-
-}  // namespace v8
+namespace std {
 
-int isnan(double x);
+int isfinite(double x);
 int isinf(double x);
+int isnan(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_