[Openal] OpenAL Soft 1.10.622 is released!

[Chris Robinson]

May we forget about 1.9...

http://kcat.strangesoft.net/openal.html

Hopefully, finally, for real, fixed the PulseAudio backend this time. Also 
fixed the OSS and Solaris backends. 7.1 output should work properly again, and 
fixed a problem/potential crash when setting an AL_EFFECT_NULL effect on an 
auxiliary slot.

In terms of features, there's only a few. Backend libraries are only loaded 
when they're needed now, so unused backends won't hold their shared libs in 
memory, and devices provided by them are automatically added and removed as 
the libs are installed and uninstalled. Additionally, multiple contexts per 
device are now supported.

Given multiple contexts, it's now possible to change certain device parameters 
on the fly. Creating a new context with certain attributes (eg. ALC_FREQUENCY, 
and perhaps ALC_REFRESH in the future) will change the device parameters, and 
consequently affects all contexts on the device.


Now I'll try to get back to taking care of those proposed extensions. It may 
be possible to see alcSuspendContext/alcProcessContext properly supported, as 
well.