Allow re-targeting of naclports install

examples/games/scummvm-1.2.1/nacl-scummvm-1.2.1.sh

 #!/bin/bash
 # Copyright (c) 2012 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.
 #
 
 # nacl-scummvm-1.2.1.sh
 #
 # usage:  nacl-scummvm-1.2.1.sh
 #
@@ skipping 24 matching lines @@
   export AR=${NACLAR}
   export CXXFLAGS="-I${NACL_SDK_ROOT}/include"
   export LDFLAGS=""
   if [ ${NACL_ARCH} = "pnacl" ] ; then
     export CXXFLAGS="-O3 -g"
     export LDFLAGS="-O0 -static"
   fi
   # without this setting *make* will not show the full command lines
   export VERBOSE_BUILD=1
   export RANLIB=${NACLRANLIB}
-  export PKG_CONFIG_PATH=${NACL_SDK_USR_LIB}/pkgconfig
-  export PKG_CONFIG_LIBDIR=${NACL_SDK_USR_LIB}
+  export PKG_CONFIG_PATH=${NACLPORTS_LIBDIR}/pkgconfig
+  export PKG_CONFIG_LIBDIR=${NACLPORTS_LIBDIR}
   export PATH="${NACL_BIN_PATH}:${PATH}"
-  export PATH="${NACL_SDK_USR_BIN}:${PATH}"
+  export PATH="${NACLPORTS_PREFIX_BIN}:${PATH}"
   export DEFINES=
   if [ "${NACL_GLIBC}" != "1" ]; then
     export DEFINES="-Dstrdup\(a\)=strcpy\(\(char\*\)malloc\(strlen\(a\)+1\),a\)"
     export DEFINES="$DEFINES -Dvsnprintf\(a,b,c,d\)=vsprintf\(a,c,d\)"
     export DEFINES="$DEFINES -Dsnprintf\(a,b,c,...\)=sprintf\(a,c,__VA_ARGS__\)"
     export DEFINES="$DEFINES -Dstrcasecmp=strcmp"
     export DEFINES="$DEFINES -Dstrncasecmp=strncmp"
   fi
   export DEFINES="$DEFINES -DNACL -DSYSTEM_NOT_SUPPORTING_D_TYPE=1"
   export LIBS=
   export LIBS="$LIBS -Wl,--whole-archive"
   export LIBS="$LIBS -lppapi"
   export LIBS="$LIBS -lppapi_cpp"
   export LIBS="$LIBS -lvorbisfile -lvorbis -logg"
   export LIBS="$LIBS -lnacl-mounts"
   export LIBS="$LIBS -Wl,--no-whole-archive"
   export CPPFLAGS="-I$NACL_PACKAGES_LIBRARIES"
 
   ChangeDir ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
   Remove ${PACKAGE_NAME}-build
   MakeDir ${PACKAGE_NAME}-build
   # NOTE: disabled mt32emu because it using inline assembly that won't
   #     validate.
   cd ${PACKAGE_NAME}-build
   ../configure \
     --host=nacl \
-    --libdir=${NACL_SDK_USR_LIB} \
+    --libdir=${NACLPORTS_LIBDIR} \
     --disable-flac \
     --disable-zlib \
     --disable-mt32emu \
     --disable-all-engines \
     --enable-lure \
     --enable-sky
 }
 
 CustomInstallStep() {
   ChangeDir ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
@@ skipping 122 matching lines @@
   DefaultExtractBzipStep
   CustomPatchStep
   CustomConfigureStep
   DefaultBuildStep
   CustomInstallStep
   DefaultCleanUpStep
 }
 
 CustomPackageInstall
 exit 0