ncurses: vendor import version 6.5

Update to 6.2-20200215

While I didn't plan another upgrade, This version incorporate fixes from
kevans@ so let's upgrade to it

Update ncurses to 20200118

Among the changes from before:
- Add support for extended colors on widechar version
- Enable ncurses extended functions
- Enable version 2 of the extended mouse support
- Enable SCREEN extensions

Modification that differs from upstream:
- _nc_delink_entries used to be exposed and was turn static,
turn it back as dynamic to not break abi
- Adapt our old termcap.c to modern ncurses

MFC after: 3 weeks

- Flatten the vendor area

Import ncurses-5.2-20010512 onto the vendor branch

Obtained from: ftp://dickey.his.com/ncurses/

Import ncurses-5.1-20001009 onto the vendor branch

Import unmodified (but trimmed) ncurses 5.0 prerelease 990821.
This contains the full eti (panel, form, menu) extensions.
bmake glue to follow.

Obtained from: ftp://ftp.clark.net/pub/dickey/ncurses

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Import ncurses-5.2-20010512 onto the vendor branch

Obtained from: ftp://dickey.his.com/ncurses/

Import ncurses-5.1-20001009 onto the vendor branch

Import unmodified (but trimmed) ncurses 5.0 prerelease 990821.
This contains the full eti (panel, form, menu) extensions.
bmake glue to follow.

Obtained from: ftp://ftp.clark.net/pub/dickey/ncurses