I modified SConscript, SConstruct and build_config.py to allow choosing
OpenAL sound system (or no sound system at all) by passing a simple
option to scons. Still, it defaults to fmod as the sound system.
However, I believe this will greatly simplify OpenAL testing, as it will
no longer require modifying these files by hand (and figuring out what
I hope it gets merged into official tree (patch done against revision
1892 of FreeOrion svn)