Fix Windows build:

runtime/bin/fdutils_macos.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 <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"
 
 
 bool FDUtils::SetCloseOnExec(intptr_t fd) {
   intptr_t status;
   status = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD));
   if (status < 0) {
     perror("fcntl F_GETFD failed");
     return false;
@@ skipping 107 matching lines @@
       ASSERT(errno != EWOULDBLOCK);
       return -1;
     } else {
       ASSERT(bytes_written > 0);
       remaining -= bytes_written;
       buffer_pos += bytes_written;
     }
   }
   return count;
 }
+
+#endif  // defined(TARGET_OS_MACOS)