Copy Linux me2me script to output dir for GN builds

remoting/host/linux/remoting_me2me_host_wrapper.sh

+#!/bin/sh
+
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This is a simple wrapper script around the remoting_me2me_host binary,
+# intended only for development use. It is copied into a build
+# subdirectory as
+# $CHROMIUM_OUTPUT_DIR/remoting/chrome-remote-desktop-host
+# and runs the remoting_me2me_host binary in the parent output directory.
+# The linux_me2me_host.py script is also copied into the remoting/
+# build directory, so it finds this host wrapper script in the same
+# directory.
+
+exec "$(dirname "$0")/../remoting_me2me_host" "$@"