[bug #59524] doc/groff.texi: Warnings from texi2dvi about undefined flags

[G. Branden Robinson]

Update of bug #59524 (project groff):

              Item Group: Warning/Suspicious behaviour => Build/Installation  
  
                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #3:


commit 63c7249ee502f69bed9da0b76a0e33c46a47332a
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Apr 17 21:38:00 2021 +1000

    doc/groff.texi: Drop Texinfo pre-5.0 workarounds.
    
    Our local macros produced many warnings during generation of our Texinfo
    manual.
    
    * doc/groff.texi (Langlemacro):
      (Ranglemacro):
      (Lparenmacro):
      (Rparenmacro):
      (Lbrackmacro):
      (Rbrackmacro): Delete.  Replace call sites with literals.
      (Lbracemacro):
      (Rbracemacro): Delete.  Replace call sites with @lbracechar{} and
      @rbracechar{}.
      (angles): Reimplement in terms of @guilsinglleft{} and
      @guilsinglright{}.  Flesh out comment.
    
    Fixes remainder of <https://savannah.gnu.org/bugs/?59524>.
    
    I tested Info (text) and PDF generation only with Texinfo 6.7 but in
    implementing the changes I used only features documented in the Texinfo
    5.0 manual.  I am not certain that the cosmetic/rendering problems (such
    as font choice) noted in the now-deleted comments were all fixed by the
    time of Texinfo 5.0, but they seem to be now.


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