[NaCl SDK] lua sample: Clean existing naclports installs before building.

R=binji@chromium.org

Review URL: https://codereview.chromium.org/304393006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273938 0039d316-1c4b-4281-b951-d872f2087c98

native_client_sdk/src/gonacl_appengine/src/lua/build.sh

@@ -66,8 +66,13 @@ pushd ${NACLPORTS_DIR}
 gclient sync -r ${NACLPORTS_REV}
 popd
 
+
 Banner Building lua
 pushd ${NACLPORTS_DIR}/src
+# Do a 'clean' first, since previous lua build from the naclports bundle
+# building might be installed in the toolchain, and that one is built
+# without readline support.
+make TOOLCHAIN=pnacl clean
 make TOOLCHAIN=pnacl lua-ppapi
 popd