[bug #65961] [grohtml] pre-html.cpp: suppress certain warnings from pnmcrop

[G. Branden Robinson]

Update of bug #65961 (group groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.24.0                 

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Follow-up Comment #5:


commit 2d71ea4cb3583385f3ff7c017a5bb6d5b0ae14dc
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Jul 9 10:51:44 2024 -0500

    [grohtml]: Fix Savannah #65961 (quieten pnmcrop).

    [grohtml]: Pass `-blank-image=pass` to pnmcrop(1) if supported by the
    installed version of Netpbm.

    * m4/groff.m4 (GROFF_PNMTOOLS_CAN_BE_QUIET): Set up an Autoheader
      template for the C/C++ preprocessor symbol `PNMCROP_PASS`.  Report the
      detected option (if any) as the result of this configuration test.
      Get the expansion into the "config.h" file with `AC_DEFINE_UNQUOTED`.
    * src/preproc/html/pre-html.cpp (imageList::createImage): Use the
      preprocessor symbol.

    Fixes <https://savannah.gnu.org/bugs/?65961>.  Thanks to Bjarni Ingi
    Gislason for the report.

    Build-tested in Debian bookworm and bullseye environments.  In the
    former, the "netpbm" package lacks `-blank-image=pass` support, and the
    latter has it.




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