Start bochs with a fixed window location

Bochs doesn’t has a parameter to specific the startup window position on screen. If you are compiling boots with SDL2. You can edit boots_source/gui/sdl2.cc, and change the first SDL_WINDOWPOS_UNDEFINED to x position and second SDL_WINDOWPOS_UNDEFINED to y position.

  window = SDL_CreateWindow(
    BOCHS_WINDOW_NAME,
    SDL_WINDOWPOS_UNDEFINED,
    SDL_WINDOWPOS_UNDEFINED,
    640,
    480,
    SDL_WINDOW_SHOWN
    );

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