[MIPS] Let python_arch script recognize MIPS arch.

build/linux/python_arch.sh

 #!/bin/sh
 # Copyright (c) 2011 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 figures out the architecture of the version of Python we are building
 # pyautolib against.
 #
 #  python_arch.sh /usr/lib/libpython2.5.so.1.0
 #  python_arch.sh /path/to/sysroot/usr/lib/libpython2.4.so.1.0
 #
 
 python=$(readlink -f "$1")
 if [ ! -r "$python" ]; then
   echo unknown
   exit 0
 fi
 file_out=$(file "$python")
 if [ $? -ne 0 ]; then
   echo unknown
   exit 0
 fi
 
 echo $file_out | grep -qs "ARM"
 if [ $? -eq 0 ]; then
   echo arm
   exit 0
 fi
 
+echo $file_out | grep -qs "MIPS"
+if [ $? -eq 0 ]; then
+  echo mipsel
+  exit 0
+fi
+
 echo $file_out | grep -qs "x86-64"
 if [ $? -eq 0 ]; then
   echo x64
   exit 0
 fi
 
 echo $file_out | grep -qs "Intel 80386"
 if [ $? -eq 0 ]; then
   echo ia32
   exit 0
 fi
 
 exit 1