[bug #62131] [preconv] should test for non-seekable stream input

[G. Branden Robinson]

Update of bug #62131 (project groff):

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

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Follow-up Comment #2:


commit ecf7aeccbb4e5ecf54277117b503edf27dffbd9f
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Mar 3 05:24:08 2022 +1100

    [preconv]: Test operands for seekability.
    
    Stop assuming that the default input stream, or an explicit '-' operand,
    is the only unseekable stream.  Check instead.
    
    * src/preproc/preconv/preconv.cpp (do_file): Add new Boolean
      `is_seekable`.  Test the input stream with `fseek()` per a suggestion
      from Ingo Schwarze.  Report unseekability in debug output and skip
      coding tag and uchardet tests altogether (precisely paralleling our
      description in the preconv(1) man page).  Also update debugging output
      to say "<standard input>" instead of "-".
    
    Fixes <https://savannah.gnu.org/bugs/?62131>.
    
    Also add editor aid comments and drop old style Emacs file-local
    variable setting.


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