Add support for new pnacl native toolchain driver

ports/devenv-latest/build.sh

 # Copyright (c) 2014 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.
 
 BuildStep() {
   # Build a local package index of pkg files
   Banner "Building pkg for host"
   ${NACL_SRC}/build_tools/build_repo.sh -l
 }
 
 InstallStep() {
   # Meta package, no install.
   return
 }
 
 PostInstallTestStep() {
   local arches=
   if [[ ${OS_NAME} == Darwin && ${NACL_ARCH} == x86_64 ]]; then
     echo "Skipping devenv tests on unsupported mac + x86_64 configuration."
   elif [[ ${NACL_ARCH} == arm ]]; then
     echo "Skipping devenv tests on arm for now."
-  elif [[ ${NACL_ARCH} == pnacl ]]; then
+  elif [[ ${NACL_ARCH} == pnacl  || ${NACL_ARCH} == le32 ]]; then
     arches="i686 x86_64"
   else
     arches="${NACL_ARCH}"
   fi
   for arch in ${arches}; do
     LogExecute python ${START_DIR}/../devenv/devenv_large_test.py \
       -p latest=1 \
       -C ${NACL_SRC}/out/publish \
       -x -v -a ${arch}
     # TODO(bradnelson): Re-enable.
     #LogExecute python ${START_DIR}/../devenv/demo2014_test.py \
       #-p latest=1 \
       #-C ${NACL_SRC}/out \
       #-x -v -a ${arch}
   done
 }