Change VALIDATOR path.

It’s necessary to add inside ~/.emscripten the path to the Validator like :

LLVM_ROOT = os.path.expanduser('/Volumes/APPLE_MEDIA/WORKSPACE/compilo/llvm/3.2/bin') # directory for emscripten

LLVM_VALIDATOR_ROOT = os.path.expanduser('/Volumes/APPLE_MEDIA/WORKSPACE/compilo/llvm/3.4/bin') # directory for webcl validator