Switch devenv to use pkg packages

ports/twm/build.sh

 # Copyright (c) 2014 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.
 
 EXECUTABLES="twm${NACL_EXEEXT}"
 NACLPORTS_CPPFLAGS+=" -Dmain=nacl_main"
 
 export LIBS="\
   -lXext -lXmu -lSM -lICE -lXt -lX11 -lxcb -lXau ${NACL_CLI_MAIN_LIB}"
 
@@ skipping 16 matching lines @@
   echo '    (char *) 0 };' >>${RC}
 
   LogExecute flex ${SRC_DIR}/lex.l
   LogExecute bison --defines=gram.h ${SRC_DIR}/gram.y
   SetupCrossEnvironment
   LogExecute ${CC} ${CPPFLAGS} ${CFLAGS} -o twm ${SRC_DIR}/*.c *.c -I. \
     -I${SRC_DIR} ${LDFLAGS} ${LIBS}
   LogExecute ${CC} ${CPPFLAGS} ${CFLAGS} -o twm${NACL_EXEEXT} ${SRC_DIR}/*.c\
    *.c -I. -I${SRC_DIR} ${LDFLAGS} ${LIBS}
 }
-
-InstallStep() {
-  return
-}
-
-PublishStep() {
-  PublishByArchForDevEnv
-  ChangeDir ${PUBLISH_DIR}
-  LogExecute cp -f ${BUILD_DIR}/twm${NACL_EXEEXT} twm_${NACL_ARCH}${NACL_EXEEXT}
-  LogExecute python ${NACL_SDK_ROOT}/tools/create_nmf.py\
-   twm_*${NACL_EXEEXT} -s . -o twm.nmf
-  LogExecute python ${TOOLS_DIR}/create_term.py -n twm twm.nmf
-  InstallNaClTerm .
-  LogExecute cp -f ${START_DIR}/*.js .
-}