🚀 go-pugleaf

I have a guest account on a symmetry to do some benching, and of
course, the first thing I tried was to bring up gnu.  I knew I'd seen
a m-symmetry.h recently but couldn't find it.  So I monte carlo'd
m-sequent.h.

Compiles, unexecs, and appears to run fine.  I added comments to this
effect and updated the copyright.

*** m-sequent.h.dist	Thu May 19 16:38:09 1988
--- m-sequent.h	Tue Sep 20 22:11:37 1988
***************
*** 1,5
! /* m- file for SEQUENT BALANCE machines
!    Copyright (C) 1985, 1986 Free Software Foundation, Inc.
  
  This file is part of GNU Emacs.
  

--- 1,5 -----
! /* m- file for SEQUENT machines; BALANCE AND SYMMETRY
!    Copyright (C) 1985, 1986, 1988 Free Software Foundation, Inc.
  
  This file is part of GNU Emacs.
  
***************
*** 19,25
  and this notice must be preserved on all copies.  */
  
  
! /* NOTE: this file works for DYNIX release 2.0 
  	  (not tested on 1.3) on NS32000's */
  
  /* The following three symbols give information on

--- 19,28 -----
  and this notice must be preserved on all copies.  */
  
  
! /* NOTE: this file works for DYNIX release 2.0
!    as of 18.48, worked on dynix 2.1.1 - 3.0.4 (at least balance)
!    as of 18.50, worked on dynix 3.0.14. (at least balance)
!    as of 18.52, worked on dynix 1.0.12 symmetry.
  	  (not tested on 1.3) on NS32000's */
  
  /* The following three symbols give information on
***************
*** 57,62
     are the ones defined so far.  */
  
  /* BTW: DYNIX defines sequent, ns32000, and ns16000 (GENIX compatibility) */
  #ifndef	sequent		/* pre DYNIX 2.1 releases */
  # define sequent
  #endif

--- 60,66 -----
     are the ones defined so far.  */
  
  /* BTW: DYNIX defines sequent, ns32000, and ns16000 (GENIX compatibility) */
+ /* and a few other things for symmetry */
  #ifndef	sequent		/* pre DYNIX 2.1 releases */
  # define sequent
  #endif