Fix Windows build:

runtime/bin/fdutils_macos.cc

Index: runtime/bin/fdutils_macos.cc
===================================================================
--- runtime/bin/fdutils_macos.cc	(revision 18787)
+++ runtime/bin/fdutils_macos.cc	(working copy)
@@ -2,11 +2,14 @@
 // 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 <fcntl.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
+#include "platform/globals.h"
+#if defined(TARGET_OS_MACOS)
 
+#include <errno.h>  // NOLINT
+#include <fcntl.h>  // NOLINT
+#include <unistd.h>  // NOLINT
+#include <sys/ioctl.h>  // NOLINT
+
 #include "bin/fdutils.h"
 
 
@@ -133,3 +136,5 @@
   }
   return count;
 }
+
+#endif  // defined(TARGET_OS_MACOS)