[openal] Compiling OpenAL (ex- OpenAL bug that freezes Blender)

[Mario Mey]

> Make sure to run 'sudo ldconfig' too, so that ld will recognize those 
> new lib names.
I did it and now, I get:

...
OpenAL version string: 1.1 ALSOFT 1.16.0
...

Great!
> And make sure you're matching 32-bit/64-bit (32-bit apps need a 32-bit 
> lib, and 64-bit apps need a 64-bit lib).
How do I know it? I'm working on 64bits... but I didn't see any "64bits 
version" anywhere...