[bug #62640] groff command insists on a device postprocessor even if -Z or -X

[G. Branden Robinson]

Update of bug #62640 (project groff):

                  Status:             In Progress => Fixed                  
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #5:


commit 3bcdc926c84abdf735b24569f86975fd97e6529a
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Jun 18 19:31:50 2022 -0500

    [groff]: Fix Savannah #62640.
    
    * src/roff/groff/groff.cpp: Add new Boolean global, `need_postdriver`,
      and initialize it true.
    
      (main): Make `need_postdriver` false if the `-X` or `-Z` options are
      given.  Test it later.  This prevents groff from exiting with a fatal
      error if an output driver is not available, but also not required.
      Also reorder null pointer equality comparison to avoid inadvertent
      lvalue assignment.
    
    Fixes <https://savannah.gnu.org/bugs/?62640>.
    
    Also update editor aid comments; drop old style Emacs file-local
    variable setting.



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