Bug#807092: afnix: Build-Depends on libncurses5

[Sven Joachim]

Source: afnix
Version: 2.5.1-1

Your package Build-Depends not only on libncurses5-dev, but also on
libncurses5, which is Wrong™.  After the Stretch release, ncurses will
change its soname, making afnix FTBFS.