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

ports/gdb/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.
 
-NACLPORTS_LIBS+=" -lncurses ${NACL_CLI_MAIN_LIB} -lm"
-NACLPORTS_CPPFLAGS+=" -Dmain=nacl_main"
+EnableCliMain
+EnableGlibcCompat
 
-EnableGlibcCompat
+NACLPORTS_LIBS+=" -lncurses -lm"
 
 if [ "${NACL_LIBC}" = "newlib" ]; then
   # Since the final link is done with -lnacl_io and not -lglibc-compat
   # we disable getrlimit and setrlimit.  TODO(sbc): add these back if/when
   # nacl_io evolves to include these functions.
   export ac_cv_func_getrlimit=no
   export ac_cv_func_setrlimit=no
 fi
 
 ConfigureStep() {
@@ skipping 112 matching lines @@
   return
   if [[ ${OS_NAME} == Darwin && ${NACL_ARCH} == x86_64 ]]; then
     echo "Skipping gdb/debug tests on unsupported mac + x86_64 configuration."
   elif [[ ${NACL_ARCH} == arm ]]; then
     echo "Skipping gdb/debug tests on arm for now."
   else
     LogExecute python ${START_DIR}/gdb_test.py -x -vv -a ${NACL_ARCH}
     LogExecute python ${START_DIR}/debugger_test.py -x -vv -a ${NACL_ARCH}
   fi
 }