Add top level build script for building packages.

ports/curl/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 ac_cv_func_gethostbyname=yes
 export ac_cv_func_getaddrinfo=no
 export ac_cv_func_connect=yes
 export LIBS="-lnacl_io -lpthread -l${NACL_CPP_LIB}"
 
 if [ $NACL_GLIBC = 1 ]; then
   EXECUTABLE_DIR=.libs
 else
   EXECUTABLE_DIR=.
 fi
 
 EXECUTABLES=src/${EXECUTABLE_DIR}/curl${NACL_EXEEXT}
 CFLAGS+=" -DDEBUGBUILD"
 #EXTRA_CONFIGURE_ARGS="--enable-debug --disable-curldebug"
 
 BuildStep() {
   # Run the build twice, initially to build the sel_ldr version
   # and secondly to build the PPAPI version based on nacl_io.
   # Touch tool_main.c to ensure that it gets rebuilt each time.
   # This is the only file that depends on the PPAPI define and
   # therefore will differ between PPAPI and sel_ldr versions.
-  local SRC_DIR=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_DIR}
   if [ -f ${SRC_DIR}/src/tool_main.c ]; then
     touch ${SRC_DIR}/src/tool_main.c
   fi
   DefaultBuildStep
 
   Banner "Build curl_ppapi"
   touch ${SRC_DIR}/src/tool_main.c
   sed -i.bak "s/CFLAGS = /CFLAGS = -DPPAPI /" src/Makefile
   sed -i.bak "s/curl\$(EXEEXT)/curl_ppapi\$(EXEEXT)/" src/Makefile
   local sedlibs="-lppapi_simple -lnacl_io -lppapi_cpp -lppapi -l${NACL_CPP_LIB}"
@@ skipping 29 matching lines @@
   LogExecute python ${NACL_SDK_ROOT}/tools/create_nmf.py \
       ${PUBLISH_DIR}/curl_ppapi*${NACL_EXEEXT} \
       -s ${PUBLISH_DIR} \
       -o curl.nmf
 
   InstallNaClTerm ${PUBLISH_DIR}
   LogExecute cp ${START_DIR}/index.html ${PUBLISH_DIR}
   LogExecute cp ${START_DIR}/curl.js ${PUBLISH_DIR}
   LogExecute cp curl.nmf ${PUBLISH_DIR}
 }
-
-PackageInstall
-exit 0