Build Uniaud32 without DDK

[gentux2]

This is closely related to Ticket #51.

While not entirely impossible, the DDK is hard to get these days, so it does keep some people from building Uniaud32 who might otherwise.

This makes it extremely difficult to debug Uniaud in the same way that ALSA does, as they rely on testers and bug reporters to build the driver themselves for testing.

It is important to note that under the GPL, we can include the DDK headers as-is, but any replacement code must be GPL, so essentially it must be implemented anew in Uniaud.