Switch from using 'nacl_main' to 'main' entry point

ports/bzip2/build.sh

 # Copyright (c) 2011 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.
 
 BUILD_DIR=${SRC_DIR}
 EXECUTABLES="bzip2"
 
-NACLPORTS_CFLAGS+=" -Dmain=nacl_main -fPIC"
-NACLPORTS_LDFLAGS+=" ${NACL_CLI_MAIN_LIB}"
+EnableCliMain
+NACLPORTS_CFLAGS+=" -fPIC"
 
 ConfigureStep() {
   return
 }
 
 BuildStep() {
   SetupCrossEnvironment
   LogExecute make clean
   LogExecute make \
       CC="${CC}" AR="${AR}" RANLIB="${RANLIB}" \
@@ skipping 18 matching lines @@
   LogExecute cp -f bzip2 ${DESTDIR}${PREFIX}/bin
   LogExecute chmod a+r ${DESTDIR_INCLUDE}/bzlib.h
 
   LogExecute cp -f libbz2.a ${DESTDIR_LIB}
   if [ -f libbz2.so.1.0 ]; then
     LogExecute ln -s libbz2.so.1.0 libbz2.so
     LogExecute cp -af libbz2.so* ${DESTDIR_LIB}
   fi
   LogExecute chmod a+r ${DESTDIR_LIB}/libbz2.*
 }