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

ports/thttpd/build.sh

 # 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.
 
 BUILD_DIR=${SRC_DIR}
 
+EnableCliMain
+
 ConfigureStep() {
   ChangeDir ${SRC_DIR}
   FILES="
 my_syslog.h
 syslog.cpp
 Makefile"
   for FILE in $FILES; do
     cp -f ${START_DIR}/${FILE} .
   done
 
   LogExecute make -j${OS_JOBS} clean
 }
 
 BuildStep() {
   # export the nacl tools
   # The checked-in Makefile has more configuration for this example.
   SetupCrossEnvironment
   export NACLPORTS_CPPFLAGS
   export NACLPORTS_CFLAGS
   export NACLPORTS_LDFLAGS
+  export NACLPORTS_LIBS
   LogExecute make -j${OS_JOBS} thttpd
 }
 
 InstallStep() {
   MakeDir ${PUBLISH_DIR}
   install ${START_DIR}/thttpd.html ${PUBLISH_DIR}
   install ${START_DIR}/nacl.js ${PUBLISH_DIR}
   install ${START_DIR}/json2min.js ${PUBLISH_DIR}
   cp ${BUILD_DIR}/thttpd ${BUILD_DIR}/thttpd_${NACL_ARCH}${NACL_EXEEXT}
   install ${BUILD_DIR}/thttpd_${NACL_ARCH}${NACL_EXEEXT} ${PUBLISH_DIR}/
   ChangeDir ${PUBLISH_DIR}
 
   CMD="$NACL_SDK_ROOT/tools/create_nmf.py \
       -o thttpd.nmf -s . \
       thttpd_*${NACL_EXEEXT}"
 
   LogExecute $CMD
 }