Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Make talk(1) capable of displaying UTF-8 characters.

Sponsored by: Nginx, Inc.

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

Move unistd.h includes to individual .c files and remove unnecessary
includes.

ANSIfy function prototypes. While I am there, constify some parameters and
make use of C99 sparse initialization for static variables, this makes talk(1)
to compile cleanly with WARNS=6.

remove whitespace at end of line

Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup,
especially in troff files.

Clear local screen when ^D is typed.
Use setproctitle to remove arguments from 'ps' output.

MFC after: 3 days

WARNS=2 fixes with NO_WERROR set because of system-header originating
warnings. Use __FBSDID().

$Id$ -> $FreeBSD$

Add rcsid. Remove unused #includes (what about RU# ?). Change exit(-1) and
add usage().

Update some ancient warts in talk:
- use termios, not sgtty
- dont use _putchar(), that was a BSD-curses specific feature not in
other curses packages (such as ncurses)
- use sigaction, not sigvec while I'm there
- box() does different things under sysv/ncurses on 1-line high windows,
and BSD-curses doesn't have hline(), so do it by adding characters
instead. That works on both styles of curses.

Cast to unsigned char instead of unsigned
Cast ctype argument to unsigned char

Make talk automagically find out the interface IP address where the
remote peer will be connected through. This avoids the ``Checking for
invitation on caller's machine'' problem for multi-homed hosts.

Thanks to: Garrett, for his `find_interface' example

Make talk ctype-aware, handle controns as tcsh does, use human-oriented
scroll, most of changes from 1.x

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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