The syntax errors in the enum lists tell us that no one ever actually
compiled this `WINVER < _WIN32_WINNT_VISTA` fallback path. 2f5bc17 made
it increasingly unlikely for retro Windows builds to hit this path by
adding a new set of `WINVER` override rules to `SDL_windows.h` that
check for the presence of certain headers. `HAVE_MMDEVICEAPI_H` in
particular will be `#define`d for any CMake build with a ≥Vista-era
SDK, such as Visual Studio 2017's `v141_xp` toolset that 2f5bc17
targeted, and it's also unconditionally defined in the default
`SDL_build_config_windows.h` configuration used by the ready-made
Visual Studio project.
These fixes work for a XP-era configuration that undefines all of the
`HAVE_*_H` macros and `SDL_VIDEO_RENDER_D3D12` to make `SDL_windows.h`
fall through to the `#define _WIN32_WINNT _WIN32_WINNT_WINXP` case, on
both Visual Studio 2022 and Visual Studio 2017's `v141_xp` toolset.
Simple DirectMedia Layer (SDL for short) is a cross-platform library
designed to make it easy to write multi-media software, such as games
and emulators.
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