This change isn't readily apparent when looking at the build window, as you can see in this picture, there isn't any information to indicate the Native Client build isn't supported. I suspect this is the first step to phasing out NACL support entirely, similar to the removal of Flash build exports
- Google Native Client support is not functional in Unity 4.3. If you need to publish to Native Client you can still use Unity 4.2.2.
. Hopefully this helps anyone who stumbles into this when trying to use the UNITY_NACL define