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

runtime/platform/globals.h

 // 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.
 
 #ifndef PLATFORM_GLOBALS_H_
 #define PLATFORM_GLOBALS_H_
 
 // __STDC_FORMAT_MACROS has to be defined before including <inttypes.h> to
 // enable platform independent printf format specifiers.
 #ifndef __STDC_FORMAT_MACROS
@@ skipping 19 matching lines @@
 
 #if !defined(_WIN32)
 #include <arpa/inet.h>
 #include <inttypes.h>
 #include <stdint.h>
 #include <unistd.h>
 #endif
 
 #include <float.h>
 #include <limits.h>
-#include <math.h>
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
 
+#include <cmath>
+
 #if defined(_WIN32)
 #include "platform/c99_support_win.h"
 #include "platform/inttypes_support_win.h"
 #include "platform/floating_point_win.h"
 #endif
 
 #if !defined(_WIN32)
 #include "platform/floating_point.h"
 #endif
 
@@ skipping 443 matching lines @@
 // N.B.: As the GCC manual states, "[s]ince non-static C++ methods
 // have an implicit 'this' argument, the arguments of such methods
 // should be counted from two, not one."
 #define PRINTF_ATTRIBUTE(string_index, first_to_check) \
   __attribute__((__format__(__printf__, string_index, first_to_check)))
 #else
 #define PRINTF_ATTRIBUTE(string_index, first_to_check)
 #endif
 
 #endif  // PLATFORM_GLOBALS_H_