[bug #61302] [tests] non-portable use of echo

[G. Branden Robinson]

Update of bug #61302 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 
                 Summary:            Build errors => [tests] non-portable use
of echo

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Follow-up Comment #8:

The only groff problems turned out to be my non-portable use of echo in some
test scripts.

I see the pnmcrop diagnostics on Mac OS X as well, but they are harmless; the
images linked by the pic-*.html and webpage.html files look intact and
correct.  It appears that some versions of pnmcrop ignore the command's
`-quiet` flag, which pre-grohtml is definitely passing to it.  So, not our
problem.


commit 244e55f660e33cdb84cec3baea7eca69279cf579
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Oct 9 17:51:50 2021 +1100

    [tests]: Fix portability problems in 2 tests.
    
    * src/roff/groff/tests/break_zero-length_output_line_sanely.sh:
    * tmac/tests/s_PN-works.sh: Migrate from `echo` to `printf` for test
      inputs containing backslashes to be interpreted literally.
    
    Fixes part of <https://savannah.gnu.org/bugs/?61302>.  Thanks to Deri
    James for identifying the problem.


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