[bug #66040] [troff] no longer warns about unrecognized .hcode input

[G. Branden Robinson]

Follow-up Comment #7, bug #66040 (group groff):

On second thought, it feels more orthogonal to go ahead and copy an
uninitialized (zero) value from the second member of a hyphenation code pair.

And that would also solve the "problem" noted in a "TODO" commend of
permitting the removal of a value from a hyphenation code.

(Though that's already possible, I think, with requests like `hcode a $` or
`hcode \['e] #`.)

(Also this stuff is too friggin' hard to introspect.  I feel myself itching to
write a `phcode` request to dump these things.)


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