[bug #43569] [PATCH] fix compile warnings with gcc 4.6.3

[G. Branden Robinson]

Update of bug #43569 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #11:

I've fixed the last of these.


commit 363fc31eebf42a61f6eeddb423492321d0f70544
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Apr 15 15:26:50 2022 +1000

    [refer]: Quieten compiler warning.
    
    * src/preproc/refer/label.ypp: Drop redundant declaration of `yyparse`.
      Both byacc 20140715 and GNU Bison 3.3.2 supply the the function
      prototype themselves.  Addresses "-Wredundant-decls" warning from GCC.
    
    Fixes <https://savannah.gnu.org/bugs/?43569>.
    
    Also update editor aid comments; drop old-style Emacs file-local
    variable setting.

commit d247763cfe9e71fd453ac828d35ab8b207c962fd
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Apr 15 09:09:26 2022 +1000

    [grn]: Slightly refactor.
    
    * src/preproc/grn/hdb.cpp (DBGetType): Lower fatal diagnostics to errors
      when encounting invalid element type characters.  Return a value
      interpreted by our caller as an error indication instead.  Helps
      compilers determine that we're not implicitly falling through our
      cases.  Addresses "-Wimplicit-fallthrough" warnings from GCC.



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