Update mips sysroot creator script

tools/trusted_cross_toolchains/trusted-toolchain-creator.armhf.sh

 #!/bin/bash
 # Copyright (c) 2012 The Native Client 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 script builds the (trusted) sysroot image for ARM.
 #@ It must be run from the native_client/ directory.
 #@ Set $DIST to 'trusty' to build trusty rather then precise image.
 #@
 #@ The sysroot consists primarily of ARM headers and libraries.
@@ skipping 379 matching lines @@
   local package_list="${TMP}/Packages.${DIST}.bz2"
   local package_list2="${TMP}/Packages.${DIST}-security.bz2"
   DownloadOrCopy ${PACKAGE_LIST} ${package_list}
   DownloadOrCopy ${PACKAGE_LIST2} ${package_list2}
   bzcat ${package_list} ${package_list2} | egrep '^(Package:|Filename:)' > ${TMP}/Packages
 
   . "${RAW_DEP_LIST}"
   GeneratePackageList ${BASE_DEP_LIST} "${BASE_PACKAGES}"
 }
 
+help() {
+  Usage
+}
+
 if [[ $# -eq 0 ]] ; then
   echo "ERROR: you must specify a mode on the commandline"
   echo
   Usage
   exit -1
 elif [[ "$(type -t $1)" != "function" ]]; then
   echo "ERROR: unknown function '$1'." >&2
   echo "For help, try:"
   echo "    $0 help"
   exit 1
 else
   ChangeDirectory
   SanityCheck
   "$@"
 fi