Update tcsh to version 6.23.02 / rev 80 via SR 945613
    
    https://build.opensuse.org/request/show/945613
    by user WernerFink + dimstar_suse
    - Update to tcsh 6.23.02
       9. Make the \U escape up to 8 hex digits.
       8. V6.23.01 - 20211209
       7. add \cc and \Uhhh, and document escape sequences
       6. add $'string with escapes' ("dollar-single-quotes") (Kimmo Suominen)
       5. don't glob the filetest builtin arguments twice
       4. remove the duplicate echo escape parsing code and use parseescape
       3. add \x{hh} \xhh \uhhh (H.Merijn Brand)
       2. fix and document ln=target
       1. Merge in patches from pkgsrc:
          - Modernize the installation targets so that they use INSTALL_DATA,
            INSTALL_PROGRAM, and MKDIR_P.
          - Enable SYSMALLOC and SHORT_STRINGS on NetBSD.
          - Enable NO_FIX_MALLOC and SHORT_STRINGS on OpenBSD.
    - Port patches
      * tcsh-6.17.06-dspmbyte.dif
      * tcsh-6.18.03-catalogs.dif
      * tcsh-6.21.00.dif