Update brp-check-suse to version 84.87+git20201203.5008eba / rev 68 via SR 863264
    
    https://build.opensuse.org/request/show/863264
    by user coolo + dimstar_suse
    - Update to version 84.87+git20201203.5008eba:
      * brp-25-symlink: Detect if a link points inside the build root
      * brp-25-symlink: Remove unused $link part of the case statement
      * brp-25-symlink: Print all errors before exiting
      * Makefile: enable -O2, use standard variables and clean up
      * simplify split_paths using std::getline