Re: openal32: Add alBufferSubDataEXT

[Chris Robinson]

I'm not sure it's very appropriate to add this yet, since the extension isn't 
finalized. Until it's finalized, there could be changes that modify the API 
calls (I don't expect changes, but it's best to err on the side of caution, I 
think).

The alBufferDataStatic patch is fine, though.