[MIPS] Fix missing definitions for MIPS arch in build and driver scripts

pnacl/build.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.
 #
 #@                 Untrusted Toolchain Manager
 #@-------------------------------------------------------------------
 #@ This script builds the ARM and PNaCl untrusted toolchains.
 #@ It MUST be run from the native_client/ directory.
 ######################################################################
@@ skipping 1441 matching lines @@
 #########################################################################
 #########################################################################
 
 libgcc_eh-newlib() {
   StepBanner "LIBGCC_EH (from GCC 4.6) -- NEWLIB"
 
   # Build libgcc_eh.a using Newlib, and libgcc_s.so using GlibC.
   # This is a temporary situation. Eventually, libgcc_eh won't depend
   # on LibC, and it will be built once for each architecture in a neutral way.
   libgcc_eh arm    newlib
+  libgcc_eh mips32 newlib
   libgcc_eh x86-32 newlib
   libgcc_eh x86-64 newlib
 }
 
 libgcc_eh-glibc() {
   StepBanner "LIBGCC_EH (from GCC 4.6) -- GLIBC"
 
   # ARM GlibC can't be built because libc.so is missing.
   libgcc_eh x86-32 glibc
   libgcc_eh x86-64 glibc
@@ skipping 114 matching lines @@
 
 #########################################################################
 #########################################################################
 #     < COMPILER-RT >
 #########################################################################
 #########################################################################
 
 compiler-rt-all() {
   StepBanner "COMPILER-RT (LIBGCC)"
   compiler-rt arm
+  compiler-rt mips32
   compiler-rt x86-32
   compiler-rt x86-64
 }
 
 
 #+ compiler-rt           - build/install llvm's replacement for libgcc.a
 compiler-rt() {
   local arch=$1
   local src="${TC_SRC_COMPILER_RT}/lib"
   local objdir="${TC_BUILD_COMPILER_RT}-${arch}"
@@ skipping 2291 matching lines @@
   #Usage
   echo "ERROR: unknown function '$1'." >&2
   echo "For help, try:"
   echo "    $0 help"
   exit 1
 fi
 
 hg-migrate
 
 "$@"