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

runtime/platform/floating_point_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #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
 double fmod_ieee(double x, double y) {
   // x is dividend, y is divisor.
   // Work around MS fmod bugs. ISO Standard says:
   // 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);
   }
   return x;
 }
 
 // Bring MSVC atan2 behavior in line with ISO standard.
 // MSVC atan2 returns NaN when x and y are either +infinity or -infinity.
 // Per ISO standard:
 //  - If y is +/-infinity and x is -infinity, +/-3*pi/4 is returned.
@@ skipping 11 matching lines @@
     static double atans_at_infinities[2][2] =
       { { atan2(1.,  1.), atan2(1.,  -1.) },
         { atan2(-1., 1.), atan2(-1., -1.) } };
     return atans_at_infinities[index_x][index_y];
   } else {
     return atan2(x, y);
   }
 }
 
 #endif  // defined(TARGET_OS_WINDOWS)