[NaCl SDK] Fix buiding of gonacl lua demo

TBR=binji

Review URL: https://codereview.chromium.org/47883002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231335 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231335