Log Message:
shells/fish: fix ncurses linkage, from Chavdar Ivanov and RVP in PR 57365

Only add -lterminfo when using base curses on NetBSD, not ncurses.
Also put it in LIBS, not LDFLAGS :-)

The previous behavior gives a bad build, but only with non-default
settings, so I'm not bumping the revision.

XXX: the magic to add -lterminfo probably belongs in curses.bl3.mk