Prepare for removal of source_filter.gypi:

runtime/bin/utils_macos.cc

Index: runtime/bin/utils_macos.cc
===================================================================
--- runtime/bin/utils_macos.cc	(revision 18775)
+++ runtime/bin/utils_macos.cc	(working copy)
@@ -2,10 +2,13 @@
 // 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 <errno.h>
-#include <netdb.h>
-#include <sys/time.h>
+#include "platform/globals.h"
+#if defined(TARGET_OS_MACOS)
 
+#include <errno.h>  // NOLINT
+#include <netdb.h>  // NOLINT
+#include <sys/time.h>  // NOLINT
+
 #include "bin/utils.h"
 #include "platform/assert.h"
 
@@ -83,3 +86,5 @@
   }
   return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
 }
+
+#endif  // defined(TARGET_OS_MACOS)