[PATCH v2 0/3] MR6673: d3dx9: Move targa decoding into d3dx9, part 1.

[Connor McAdams (＠cmcadams)]

This is the first set of patches to move targa decoding out of WIC and into d3dx9. The eventual goal is to add support for saving targa files.

I've pushed a branch with the rest of the patches for decoding the image [here](https://gitlab.winehq.org/cmcadams/wine/-/tree/WIP/d3dx9-targa-decode-v2) if extra context would help. I split this into two parts to make review a little less overwhelming. :)

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  v2: d3dx9: Use d3dx9 to get image information for targa files.
      d3dx9/tests: Add TGA header image info tests.
      d3dx9: Do not use WIC to detect image file format.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/6673