Make SDL2_INCLUDE_DIR point to the root #381
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So people using custom buildsystems don't need to add SDL2/ into the include path.
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So people using custom buildsystems don't need to add
SDL2/into the include path, and also would make a vcpkg patch obsolete. However, it's ... an unsolvable mess:SDL2/prefix (yay)SDL/. Fortunately that's "just" an#ifdef.SDL2/prefix. One option would be to detect this via CMake and then expose that in the globalconfigure.h, but that's very ugly. Another option would be to use__has_include(), but on the only system where this matters, MSVC supports that only since 2017 17.3 or something, would need to have an ugly fallback on older versions.Keeping it as-is right now, may revisit this when I get a better idea on how to fix it.