[PATCH v2 0/6] MR6776: d3dx9: D3DXSaveSurfaceToFileInMemory() refactoring, part 1.

[Connor McAdams (＠cmcadams)]

This is the first of 3 planned MRs reworking how `D3DXSaveSurfaceToFileInMemory()` functions, starting with DDS files.

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  v2: d3dx9: Add support for saving paletted surfaces to DDS files.
      d3dx9: Set the DDSCAPS_ALPHA flag when saving DDS files with a pixel format containing an alpha channel.
      d3dx9: Improve save_dds_surface_to_memory().
      d3dx9/tests: Add more tests for saving surfaces as DDS files.
      d3dx9: Don't attempt to save palettized surfaces in D3DXSaveSurfaceToFileInMemory().
      d3dx9/tests: Include ddraw.h in surface.c for DDS header flag definitions.

https://gitlab.winehq.org/wine/wine/-/merge_requests/6776