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

ports/bash/build.sh

 # Copyright (c) 2013 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.
 
 EnableGlibcCompat
+EnableCliMain
 
 EXTRA_CONFIGURE_ARGS="--with-curses"
 EXTRA_CONFIGURE_ARGS+=" --with-installed-readline --enable-readline"
 NACLPORTS_CPPFLAGS+=" -DHAVE_GETHOSTNAME -DNO_MAIN_ENV_ARG"
-NACLPORTS_CPPFLAGS+=" -Dmain=nacl_main -Dpipe=nacl_spawn_pipe"
-NACLPORTS_LIBS+=" ${NACL_CLI_MAIN_LIB}"
+NACLPORTS_CPPFLAGS+=" -Dpipe=nacl_spawn_pipe"
 
 EXECUTABLES="bash${NACL_EXEEXT}"
 
 # Configure requires this variable to be pre-set when cross compiling.
 export bash_cv_getcwd_malloc=yes
 
 PatchStep() {
   DefaultPatchStep
   ChangeDir ${SRC_DIR}
 }
 
 BuildStep() {
   # There is a missing depedency in the bash build system which means
   # that parallel build will sometimes fail due to lib/intl/libintl.h
   # not being generated before files that use it are compiled.
   # For example pathexp.c indirectly depends on libintl.h but compilation
   # of this file doesn't depend on the rule that generates it.
   # The fix is to explictly build lib/intl before we build everything else.
   LogExecute make -C lib/intl
   DefaultBuildStep
 }
 
 PublishStep() {
   PublishMultiArch bash${NACL_EXEEXT} bash bash_multiarch
 }