[PATCH v4 1/3] windowscodecs: Implement DdsDecoder_Wine_Initialize().

[Esme Povirk (they/them)]

Is this still breaking functionality in d3dx10 that previously worked?

My suggestion would be to move the code to DdsDecoder_Wine_Initialize,
update d3dx10 to use this interface if available, then update the
validation in DdsDecoder_Initialize.