Fix Makefile; replace surface by renderer API (#78)
* Makefile: fix compatibility with POSIX shell * Do not use surface and render SDL2 API According to https://wiki.libsdl.org/SDL_GetWindowSurface, it must not be used when the rendering API is used (which is used in osk-sdl). Use the render API instead of the surface API. * Do not prefer software rendering There is no need to use software rendering if hardware rendering is available.
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