[bug #66033] [devps] support "maintainer-mode" regeneration of font descriptions

[G. Branden Robinson]

Update of bug #66033 (group groff):

                 Summary: generate grops fonts during a groff build => [devps]
support "maintainer-mode" regeneration of font descriptions

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Follow-up Comment #1:

Revising summary.

This isn't something we can do in just _any_ build without extending our build
dependencies to include now-archaic collections of Adobe Type 1 fonts, which
are not Free Software.

Font _metrics_, which are all we care about from these collections, are simple
numeric descriptions of coarse properties of glyphs in a font, and are not
copyrightable.

In theory someone could extract the metrics from the 2 Type 1 collections we
require (see section "Old fonts" of _grops_(1)), and ship those, but I don't
personally see the point since they will seldom change.  Better just to make
this part of the boxes-to-tick list of items in our
[https://git.savannah.gnu.org/cgit/groff.git/tree/FOR-RELEASE FOR-RELEASE
file].

Odds are, once we've got the procedure documented and tested, we'll never,
ever have to do it again.  (Adobe has retired the Type 1 format.)

The Unicode Consortium will keep us busier.


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