[bug #62592] allow groff source pulled from git to build without TeX

[G. Branden Robinson]

Update of bug #62592 (project groff):

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

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Follow-up Comment #3:


commit 31f64af693b077b846ac2540f4ea2baf95c4ef10
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Jun 9 16:45:42 2022 -0500

    Weaken build dependency on TeX.
    
    [build]: Weaken dependency on TeX, instead using it (to generate the DVI
    and PDF forms of our Texinfo manual) only if it is available.
    
    * m4/groff.m4 (GROFF_USE_TEX_CHECK): Check for presence of 'tex'
      executable in path.  Set shell variable `groff_use_tex` to "yes" if
      present, and "no" otherwise.  This check runs only if the 'makeinfo'
      and 'texi2dvi' version checks have already passed.
    
    * configure.ac: Run the new check.  Set Automake conditional `USE_TEX`
      only if shell variable `groff_use_tex` is "yes".  Report whether
      "groff.dvi" and "groff.pdf" are (re-)buildable.
    
    * doc/doc.am: Parameterize names of groff.{dvi,pdf} targets as Make
      macros `GROFF_DVI` and `GROFF_PDF`.  Define them only if `USE_TEX`.
      Do _not_ update `EXTRA_DIST` macro; leave the literal file names there
      because we require that distribution archives contain these files.
    
      (.texi.dvi, .texi.pdf): Update suffix rules to check `USE_TEX` and
      fail, complaining of missing 'tex' program, if these targets are
      attempted without it being true.  Only manually specifying the file
      names as targets to 'make' or attempting to generate a distribution
      archive without TeX present should cause these errors.
    
    * INSTALL.REPO: Update dependency information.
    
    Fixes <https://savannah.gnu.org/bugs/?62592>.  Thanks to Deri James for
    the report.



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