debug: remove unused enum.
debug: remove unused enum.

AravisProject/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,lu-zero/aravis,AnilRamachandran/aravis,AravisProject/aravis,lu-zero/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,lu-zero/aravis,AravisProject/aravis,lu-zero/aravis,AravisProject/aravis,AravisProject/aravis,lu-zero/aravis