Public issue https://github.com/mackron/miniaudio/issues/355

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

This allows the engine to be used independent of a device which might
be useful for tools.

  * ma_gainer
  * ma_panner
  * ma_fader
  * ma_spatializer

These are amalgamated into miniaudio.h now and are no longer required
in the extras folder.

This also changes the order of parameters to be consistent with the new
standard for channel maps.

  * Fix an error when _MM_DENORMALS_ZERO_MASK or _MM_FLUSH_ZERO_MASK is
    not supported.

  * Fix compilation errors with TCC.