Fix OpenAL-Soft crash on exit

[matpow2]

Fix issue #30 by removing AudioDevice's crashing deconstructor (OpenAL-Soft cleans up anyway)

[LaurentGomila]

Do you really expect me to merge this commit?

[matpow2]

Yes. You should not use an atexit deconstructor to deinitialize the OpenAL context because OpenAL-Soft already does so:
http://repo.or.cz/w/openal-soft.git/blob/HEAD:/Alc/ALc.c#l466
This will lead to crashes on exit on Windows XP 32bit SP3. If you don't want to let OpenAL-Soft deinitialize the context by itself, you should add a public deinitialize method so we can tear down the context before atexit.

[LaurentGomila]

This is not a clean solution. A correct OpenAL program must call the cleanup functions corresponding to the init functions that it called at startup.

Relying on a internal/hidden undocumented "feature" is not an option.

[matpow2]

In any case, the atexit SFML AudioDevice deconstructor always crashes the program on exit (at least on Windows XP - it is most likely the case for Vista/7 too, as per #30), and to me, that's not an option, and not very clean either ;-)

If you add a public deinitialize function for the OpenAL context so we can destroy the context before atexit, that would solve the problem also. I didn't want to add a function to the API when this fix would be compatible with existing code.

Those are the two solutions I've thought about. How would you fix it otherwise?

[LaurentGomila]

I never meant that the current solution was acceptable -- that's why issue #30 exists.

But I won't implement a quick and dirty solution. I'll take some time to think about it, and hopefully find a clean and robust solution.