add most gnu m4 long options

Use hex for masks.

avoid redefinitions

branches: 1.14.4; 1.14.10;
use TOKEN_LINE from MirBSD

resolve conflicts.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

Pull in various changes from OpenBSD, most from Marc Espie, including:
* Provide some GNUisms as extensions.
* Provide dynamically growable string space.
* Make define(defn(foo)) work correctly for builtins.
(The current version is supposed to be capable of satisfying autoconf.)

All still relevant NetBSD changes have been preserved in this version, and
formatting and style fixes have been applied in various places.

Thanks to Masao Uebayashi <uebayasi@soum.co.jp> for pointing this out.

Sprinkle some const, and rename a shadow-variable.

couple more whitespace fixes, by Nathan Ahlstrom

add a typedef which describes elements in the push-back buffer. Make
that typedef 'short'. 'char' (which was previously used) because char
may be unsigned and ((char)EOF) != EOF if that is the case. That was
causing the (char)EOF (0xff) pushed back in main to be interepreted as
a character, and, in some cases, to be written to the output. 'short'
was used rather than 'signed char' because if the latter is used,
0xff characters in the input would confuse m4. (No point in introducing
(more?) 8-bit lossage.)

branches: 1.7.2;
Handle multichar comment and quote delimiters (up to 5 characters, per the
manual page). Takes care of PR#485.

Sync with 4.4BSD-Lite2

upgrade to 4.4-lite m4. no local changes of note

latest m4 from ozan. now does the right thing w/respect to sendmail

Add RCS identifiers, remove some completely useless RCS logs and patchkit
headers, and a few other insignificant changes.

baseline of new version of m4 supplied by Ozan Yigit, original author
of the broken m4 we had. This is his stuff virgin + our Makefile.

branches: 1.1.1;
Initial revision