Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r261296:

Merge from CheriBSD:
commit c1acf022c533c5ae27e0cd556977eafe3f5959eb
Author: Brooks Davis <brooks@one-eyed-alien.net>
Date: Fri Jan 17 21:46:44 2014 +0000

Add an option WITHOUT_NCURSESW to suppress building and linking to
libncursesw. While wide character support it useful we'd like to
only need one ncurses library on embedded systems.

Sponsored by: DARPA, AFRL

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Enable ncurses wide character support

Approved by: delphij (mentor)
Tested by: kris on pointyhat (early version), current@

Introduce new ncurses build glues which are part of ncurses 5.6 update.

Approved by: delphij
Inspired by: DragonFly's and lib/bind