Add top level build script for building packages.

ports/agg/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
 
 
 BuildStep() {
   cd ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
   local cflags="${NACLPORTS_CFLAGS}"
   if [ ${NACL_ARCH} != "pnacl" ]; then
     cflags="${cflags} -O3 -fomit-frame-pointer"
   fi
   if [ ${NACL_ARCH} = "i686" -o ${NACL_ARCH} = "x86_64" ]; then
     cflags="${cflags} -mfpmath=sse -msse"
   fi
   MAKEFLAGS="-j${OS_JOBS}" AGGCXXFLAGS="${cflags}" LogExecute make -j${OS_JOBS}
 }
 
 
 InstallStep() {
   # copy libs and headers manually
   ChangeDir ${NACLPORTS_INCLUDE}
   Remove ${PACKAGE_NAME}
   MakeDir ${PACKAGE_NAME}
   readonly THIS_PACKAGE_PATH=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
   cp -R ${THIS_PACKAGE_PATH}/include/*.h ${PACKAGE_NAME}/
   cp ${THIS_PACKAGE_PATH}/font_freetype/*.h ${PACKAGE_NAME}/
   ChangeDir ${NACLPORTS_LIBDIR}
   cp ${THIS_PACKAGE_PATH}/src/libagg.a .
   cp ${THIS_PACKAGE_PATH}/font_freetype/libaggfontfreetype.a .
 }
-
-
-PackageInstall
-exit 0