bug#43275: Upgrade antlr-mode to latest version

[Richard Stallman]

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  > If you need anything from my side (I am the author of antlr-mode),
  > please let me know.
  > Unfortunately, it is unrealistic for me to change the Emacs code base 
directly
  > (due to inexperience in it & time constraints).

For the long term, I expect we can make it feasible for you to do that,
if you are willing to.

For the short term, can you prepare a patch you recommend installing,
with suitable commit notes?

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)