[bug #61265] macOS sed(1) warns during `make install`

[G. Branden Robinson]

Update of bug #61265 (project groff):

                  Status:                    None => Fixed                  
             Assigned to:                    None => gbranden               
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #2:

This later got reported again to the groff mailing list and I forgot about
this ticket (I knew I'd seen the problem reported somewhere before, but failed
to search the ticket tracker).

I'll update the ChangeLog entry.


commit 2b3e0a672d426253025c32bff31fffe8439c47bc
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Oct 27 14:51:39 2021 +1100

    doc/doc.am: Cope with Mac OS X.
    
    * doc/doc.am: Make sed-based insertion of `lf` requests more portable: a
      dance is required to embed a literal newline inside a sed expression
      inside a shell command executed as part of a Make target rule.  We
      assume that neither the POSIX shell $'' operator nor a working
      printf(1) is available.
    
      (DOC_GROFF): Define a shell variable containing a literal newline,
      evading make(1) and echo(1)'s valiant attempts to consume it.
    
      (doc/pic.html, doc/webpage.html): Repeat trick, slightly modified
      since the dependency needs to be manually identified.
    
    Solution adapted from the GNU Autoconf manual, "Newlines in Make
    Rules".


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