Final testing for OpenAL Soft 1.14

The AL_SOFT_direct_channels[1] and ALC_SOFT_loopback[2] extensions are now 
considered complete, so OpenAL Soft's next release is getting close.

If anyone is able to test the latest Git version, it would be great to make 
sure everything's working as expected. Double-check that it still works with 
whatever OpenAL apps you happen to have. Of particular interest are the 
PulseAudio, CoreAudio, MMDevAPI, OpenSL/Android, and SoundIO backends, as well 
as HRTF. If you were waiting to use the new extensions, feel free to try them 
out now.

If all goes well, I expect to have a release in about a week or two.

Thanks!
- Chris

[1] http://kcat.strangesoft.net/openal-extensions/SOFT_direct_channels.txt
[2] http://kcat.strangesoft.net/openal-extensions/SOFT_loopback.txt