This is disabled by default for backwards compatibility. Use the
`calculateLFEFromSpatialChannels` config option to enable this.

If the LFE channel exists in the output channel map but not the input
channel map, we would previously just give it a weight of 0, which
caused it to not be filled.

This gives LFE a weight of 1.0f/$NumberOfSpatialChannels and basically
makes it omnidirectional.
Signed-off-by: Steven Noonan <steven@uplinklabs.net>

The error here is that exactly-matching channels were not having a
weight calculated which resulted in them being silenced.

Public issue https://github.com/mackron/miniaudio/issues/480

 Cast from 'void*' to pointer to non-'void' requires explicit type cast error under msvc compiler

Public issue https://github.com/mackron/miniaudio/issues/500

Public issue https://github.com/mackron/miniaudio/issues/499

Public issue https://github.com/mackron/miniaudio/issues/493

Public issue https://github.com/mackron/miniaudio/issues/494

Public issue https://github.com/mackron/miniaudio/issues/482

Public issue https://github.com/mackron/miniaudio/issues/485

Pubic issue https://github.com/mackron/miniaudio/issues/469

These projects are not updated to the latest version.