Update a2ps to version 4.15 / rev 51 via SR 1072656
    
    https://build.opensuse.org/request/show/1072656
    by user WernerFink + dimstar_suse
    - Updated to 4.15
     * Noteworthy changes in release 4.15 (2023-03-07) [stable]
     * Features:
       - Replace the 'psmandup' utility with simpler 'lp2' to directly print
         documents to a simplex printer.
       - Remove the outdated 'psset' and 'fixnt', and simplify 'fixps' to
         always process its input with Ghostscript.
       - Use libpaper's paper sizes. This includes user-defined paper sizes
         when using libpaper 2. It is still possible to define custom margins
         using "Medium:" specifications in the configuration file, and the
         one size defined by a2ps that libpaper does not know about, Quarto, is
         retained for backwards compatiblity, and as an example.
     * Documentation
       - Remove some obsolete explanations.
       - Reformat --help output consistently to 80 columns.
       - Some Engli