Update tig to version 2.5.5 / rev 49 via SR 946156
    
    https://build.opensuse.org/request/show/946156
    by user jubalh + dimstar_suse
    - Update to 2.5.5:
      Improvements:
      * Make word-diff a toggleable option. (#1119, #1125)
      * Add Linux installation instructions. (#1121, #1126)
      * Allow :back to work across separate blame views. (#1123, #1127)
      * Add auto-refresh to log view. (#1128)
      * Expose %(file_old), useful for deleted and renamed files. (#1132)
      * Enable jumping back in main view. (#628, #1138)
      * Add PCRE (Perl Compatible Regular Expressions) support. (#1137, #1143)
      * Pass command line args through to diff-files in status view. (#1152, #1155)
      * Remove quotes from TIG_LS_REMOTE to allow inline shell commands. (#1160,
        #1161)
      * Avoid pushing identical history state in main view.
      * Replace useless strncpy to avoid compilation warning with GCC 8.
      * Update utf8proc to v2.7.0.
      * Update distclean rul