Add missing build.scons file. Review URL: http://codereview.chromium.org/7622021
Add missing build.scons file.
Review URL: http://codereview.chromium.org/7622021

git-svn-id: e22621a84199d42b34715cdc089545aeedbbf23f@1037 050acbb0-2703-11df-ab0a-9f3f633ae91d

sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk