Cleaned up IRIX audio driver, added float32 support and fallbacks when  a specific audiospec isn't supported or the hardware fails.
Cleaned up IRIX audio driver, added float32 support and fallbacks when
 a specific audiospec isn't supported or the hardware fails.

Usual disclaimer: No IRIX box, so this may not even compile.


git-svn-id: 75429ccc2030f235ccf16e6b9b7f8e83d5edd22e@2725 c70aab31-4412-0410-b14c-859654838e24

albertz/sdl,albertz/sdl,albertz/sdl,albertz/sdl