[openal] Support SOFA in OpenAL?

[Christian Hoene]

Hi Chris,

> I noticed too that there's a requirement for libresample now, which is running into the dependency problems that made libsofa not very attractive in the first place.

I am not religious on this topic. Instead of the libresample, which other library would you recommend? Or shall I do a copy and paste from the speex code?

Best, 

 Christian