Add top level build script for building packages.

ports/openssh/build.sh

 #!/bin/bash
 # Copyright (c) 2011 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
 
 EXECUTABLES="scp${NACL_EXEEXT} ssh${NACL_EXEEXT} \
              ssh-add${NACL_EXEEXT} sshd${NACL_EXEEXT}"
 INSTALL_TARGETS="install-nokeys DESTDIR=${NACLPORTS_PREFIX}"
 
 # Force configure to recognise the existence of truncate
 # and sigaction.  Normally it will detect that both this functions
 # are implemented by glibc in terms of NOSYS.
 export ac_cv_func_truncate=yes
 export ac_cv_func_sigaction=yes
@@ skipping 17 matching lines @@
   export CXX=${NACLCXX}
   export AR=${NACLAR}
   export RANLIB=${NACLRANLIB}
   export PKG_CONFIG_PATH=${NACLPORTS_LIBDIR}/pkgconfig
   export PKG_CONFIG_LIBDIR=${NACLPORTS_LIBDIR}
   export FREETYPE_CONFIG=${NACLPORTS_PREFIX_BIN}/freetype-config
   export CFLAGS=${NACLPORTS_CFLAGS}
   export CXXFLAGS=${NACLPORTS_CXXFLAGS}
   export LDFLAGS=${NACLPORTS_LDFLAGS}
   export PATH=${NACL_BIN_PATH}:${PATH};
-  local SRC_DIR=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_DIR}
   local CONFIGURE=${NACL_CONFIGURE_PATH:-${SRC_DIR}/configure}
-  local DEFAULT_BUILD_DIR=${SRC_DIR}/${NACL_BUILD_SUBDIR}
-  local BUILD_DIR=${NACL_BUILD_DIR:-${DEFAULT_BUILD_DIR}}
   MakeDir ${BUILD_DIR}
   ChangeDir ${BUILD_DIR}
 
   local conf_host=${NACL_CROSS_PREFIX}
   if [ "${NACL_ARCH}" = "pnacl" -o "${NACL_ARCH}" = "emscripten" ]; then
     # The PNaCl tools use "pnacl-" as the prefix, but config.sub
     # does not know about "pnacl".  It only knows about "le32-nacl".
     # Unfortunately, most of the config.subs here are so old that
     # it doesn't know about that "le32" either.  So we just say "nacl".
     conf_host="nacl"
@@ skipping 22 matching lines @@
       ssh_*${NACL_EXEEXT} \
       -s . \
       -o openssh.nmf
   LogExecute python ${TOOLS_DIR}/create_term.py openssh.nmf
   popd
 
   InstallNaClTerm ${ASSEMBLY_DIR}
   LogExecute cp ${START_DIR}/background.js ${ASSEMBLY_DIR}
   LogExecute cp ${START_DIR}/manifest.json ${ASSEMBLY_DIR}
 }
-
-PackageInstall
-exit 0