ok, i tried this out myself. i don't really know anything about windows, sdl3,
or mingw, but i was able to get a static build of
nim-sdl3/examples/renderer/01-clear/clear.nim by doing the following\:
1. clone SDL and build it with `-DSDL_STATIC=ON` -- see
https://wiki.libsdl.org/SDL3/README/cmake. this will get you a libSDL3.a
2. compile the nim program with `--passL:path\to\your\libSDL3.a` (and the
necessary windows libraries? see sdl3.pc)
3. verify (by ldd or something) that there is no runtime dependency on any sdl3
dll