[bug #64937] [troff] officially support composite character unmapping

[G. Branden Robinson]

Update of bug#64937 (group groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.24.0                 

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Follow-up Comment #2:


commit 2c76a931b81b1e22dd419c7027d3517325c23193
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Jan 17 14:02:28 2024 -0600

    [troff]: Fix Savannah #64937 (del composite char).
    
    * src/roff/troff/input.cpp (map_composite_character): Stop throwing
      diagnostic message when `composite` request invoked with only one
      argument.  This has long worked just fine to delete a composite
      character mapping.  That is something a (rare) user might conceivably
      want to do.
    
    Fixes <https://savannah.gnu.org/bugs/?64937>.




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