machines/debian11: create /usr/include/SDL2
machines/debian11: create /usr/include/SDL2

This directory is referenced but does not exist:

    $ pkg-config --cflags sdl2
    -D_REENTRANT -I/usr/include/x86_64-linux-gnu/SDL2 -I/usr/include/SDL2

    $ make test
      CC        sdl_v4l_video.c
    cc1: error: /usr/include/SDL2: No such file or directory
    [-Werror=missing-include-dirs]
    cc1: all warnings being treated as errors

fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared