ncurses solidation: Remove all references to libtermcap

ncurses solidation: Remove all references to libtermcap

The termlib, termcap, and tinfo libraries are all symlinked to ncurses
library.  There's no reason to have four aliases for the same library
when none of them are exposed outside base.

termlib and tinfo aren't referenced anywhere, but libtermcap is.
This commit changes all the references to libtermcap to libncurses,
and removes the private aliases of ncurses.