[Bug-gforth] [bug #54559] Remove support for obsolete Emacsen

[Reuben Thomas]

Follow-up Comment #5, bug #54559 (project gforth):

Thanks for getting back to me, Anton!

I do not plan to add features. See the attached patch: it mainly removes
ancient commented-out code so that the rest is easier to read, and removes
some code that fills gaps in pre-Emacs 21, which is no longer needed.

There are a few other things that are noticeable: for example, on recent
Emacsen (and computers) it seems sensible to default jit-parsing to t rather
than nil. Another issue that I have come across in recent Emacsen, for
example, is that forth-find-tag does not work for me, and indeed find-tag
itself is deprecated; however, simply using the default xref-find-definitions
works fine with current etags -l forth. So again, I have simply removed this
code. I've filed a bug about forth-blocks-mode (#48406), and that would again
be easier to look into in a cleaned-up gforth.el.

I would be quite happy with your suggestion of maintaining compatibility with
pre-Emacs 21 by in that case loading an older version which itself is
essentially frozen.

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