many external program expects libncurses to not be provided as a single
library. Instead of fixing all ports, distribute ncurses the way
upstream distributes it
Turn libncursesw.so into a ldscript which will link automatically as
needed to libtinfow so so this change is seamless at compile time.
ncurses: chase dependency changes in the source tree
bsdinstall: reduce overlinking
both distextract and distfetch does not directly use ncurses,
or figpart, drop their direct link to those libs