A few shared libraries in the base system link against ncurses. An
upgrade from a 12.x host to 13 results in ABI breakage for existing
binaries since the newer versions of these libraries link against the
newer ncurses while the binary itself links against the older ncurses.
For example, dialog4ports built on 12.x crashes on 13 since it depends
on libdialog which links against ncurses internally.
Technically, libform, libmenu, and libpanel do not need a version bump
since they have been renamed, but it seems cleaner to bump the
libraries as well.