Add top level build script for building packages.

ports/vim/build.sh

 #!/bin/bash
 # 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.
 
-source pkg_info
-source ../../build_tools/common.sh
 
 export EXTRA_LIBS="-ltar -lppapi_simple -lnacl_io \
   -lppapi -lppapi_cpp -l${NACL_CPP_LIB}"
 EXECUTABLES=src/vim
 
 PatchStep() {
   DefaultPatchStep
   ChangeDir ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_DIR}
   cp ${START_DIR}/vim_pepper.c src/vim_pepper.c
 }
 
 ConfigureStep() {
   export vim_cv_toupper_broken=1
   export vim_cv_terminfo=yes
   export vim_cv_tty_mode=1
   export vim_cv_tty_group=1
   export vim_cv_getcwd_broken=yes
   export vim_cv_stat_ignores_slash=yes
   export vim_cv_memmove_handles_overlap=yes
   if [ "${NACL_DEBUG}" == "1" ]; then
     export STRIP=echo
   else
     export STRIP=${NACLSTRIP}
   fi
-  export NACL_BUILD_DIR=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_DIR}
+  export BUILD_DIR=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_DIR}
   export NACL_CONFIGURE_PATH=./configure
   DefaultConfigureStep --with-tlib=ncurses --prefix= --exec-prefix=
   # Vim's build doesn't support building outside the source tree.
   # Do a clean to make rebuild after failure predictable.
   LogExecute make clean
 }
 
 InstallStep() {
   MakeDir ${PUBLISH_DIR}
   local ASSEMBLY_DIR="${PUBLISH_DIR}/vim"
@@ skipping 16 matching lines @@
 
   InstallNaClTerm ${ASSEMBLY_DIR}
   LogExecute cp ${START_DIR}/manifest.json ${ASSEMBLY_DIR}
   LogExecute cp ${START_DIR}/background.js ${ASSEMBLY_DIR}
   LogExecute cp ${START_DIR}/icon_16.png ${ASSEMBLY_DIR}
   LogExecute cp ${START_DIR}/icon_48.png ${ASSEMBLY_DIR}
   LogExecute cp ${START_DIR}/icon_128.png ${ASSEMBLY_DIR}
   ChangeDir ${PUBLISH_DIR}
   LogExecute zip -r vim-7.3.zip vim
 }
-
-PackageInstall
-exit 0