Switch devenv to use pkg packages

ports/gawk/build.sh

 # Copyright (c) 2015 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.
 
 # getopt.c and getopt1.c have been commented for build
 NACLPORTS_CFLAGS+=" -Dmain=nacl_main"
 if [ ${TOOLCHAIN} != "glibc" ]; then
   NACLPORTS_CFLAGS+=" -D__GNU_LIBRARY__ "
 fi
 
 NACLPORTS_LDFLAGS+=" ${NACL_CLI_MAIN_LIB}"
 
 BuildStep() {
   # SetupCrossEnvironment
   # including readline because it is not linked by itself
   # ncurses also has to be linked otherwise multiple
   # undefined errors appear in linking readline
   LogExecute make -j${OS_JOBS} \
     LIBREADLINE="-lreadline -lncurses" gawk${NACL_EXEEXT}
 }
-
-InstallStep() {
-  return
-}
-
-PublishStep() {
-  PublishByArchForDevEnv
-}