Fixes Android build by using C++ math header instead of C one.

runtime/platform/floating_point_win.cc

Index: runtime/platform/floating_point_win.cc
===================================================================
--- runtime/platform/floating_point_win.cc	(revision 37827)
+++ runtime/platform/floating_point_win.cc	(working copy)
@@ -5,7 +5,6 @@
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
-#include <math.h>  // NOLINT
 #include <limits>  // NOLINT
 
 // Taken from third_party/v8/src/platform-win32.cc
@@ -15,7 +14,7 @@
   // If dividend is finite and divisor is an infinity or
   //    dividend is a zero and divisor is nonzero finite,
   // then dividend is returned.
-  if (!(_finite(x) && (!_finite(y) && !isnan(y))) &&
+  if (!(_finite(x) && (!_finite(y) && !std::isnan(y))) &&
       !(x == 0 && (y != 0 && _finite(y)))) {
     x = fmod(x, y);
   }