Sound system ignores disabled sound

[historic_bruno]

Starting the game with -nosound or -quickstart options should disable the sound system, but instead it continues to initialize and load sounds. This makes testing the game without sound impossible on some systems but also the sound system isn't dynamically disabled on errors (see #1594).

[stwf]

this is fixed by the patch in fix 1604

​​http://trac.wildfiregames.com/ticket/1604

[ben]

In 12566:

Sound system patch by stwf:
Fixes sound system to work with archives (use VFS files instead of POSIX), fixes #1604.
Improves error handling and logging, refs #1594.
Allows sound to be disabled with -nosound/-quickstart runtime options or --without-audio build option, fixes #1609, #1614.
Experimentally increases default buffer size to help prevent sound stoppages.