Do a check for nacl being enabled in devenv glibc.

ports/devenv/install-base-packages.sh

 #!/bin/bash
 # 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.
 
 # This is for bash on NaCl. Note that you cannot use external commands
 # until the installation is completed. Also, you cannot use features
 # which nacl_io does not support yet (e.g., pipes and sub-shells).
 
 set -e
 
 CheckNaClEnabled() {
-  # Skip check on if this isn't newlib.
-  if [[ ${TOOLCHAIN} != newlib ]]; then
+  # Skip check on if this isn't newlib or glibc.
+  if [[ ${TOOLCHAIN} != newlib && ${TOOLCHAIN} != glibc ]]; then
     return
   fi
   TMP_CHECK_FILE="/tmp/.enable_nacl_check.nexe"
   # Assume we can reuse the test file if present.
   if [[ ! -e ${TMP_CHECK_FILE} ]]; then
     geturl -q _platform_specific/${NACL_ARCH}/bash.nexe \
       ${TMP_CHECK_FILE} || exit 1
   fi
   set +e
   ${TMP_CHECK_FILE} -c 'exit 42'
   if [[ $? != 42 ]]; then
     echo "*********************** ERROR ***********************"
     echo
     echo "In order to use the NaCl Dev Environment, you must"
     echo "currently enable 'Native Client' at the url:"
     echo "  chrome://flags"
     echo "You must then restart your browser."
     echo
-    echo "Eventually this should not be required."
+    echo "Eventually this may not be required."
     echo "Follow this issue: https://crbug.com/477808"
     echo
     echo "*********************** ERROR ***********************"
     # TODO: A more proper way to handle error would be "exit 1" here
     # and keep window open so that error message could be shown.
     while [[ 1 == 1 ]]; do
       read
     done
   fi
   set -e
@@ skipping 44 matching lines @@
   fi
 
   if [[ ${have_gcc} == 0 ]]; then
     echo "WARNING: \
 emacs and gcc not yet available for your platform (coming soon)."
   fi
 }
 
 CheckNaClEnabled
 InstallBasePackages $@