Allow builds that reduce or eliminate the converters/resamplers.
Allow builds that reduce or eliminate the converters/resamplers.

We should probably give options to drop resamplers by channels, too, for
 developers that know they'll never need more than stereo, etc.


git-svn-id: 75429ccc2030f235ccf16e6b9b7f8e83d5edd22e@4376 c70aab31-4412-0410-b14c-859654838e24

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