Update brp-check-suse to rev 64 via SR 802526
    
    https://build.opensuse.org/request/show/802526
    by user coolo + dimstar_suse
    - Update to version 84.87+git20200510.8ff16cf:
      * Avoid relinking links to mounted kernel filesystems
      * Make all symlinks relative (bsc#1166667) (#31)
      * Get rid of the unmaintained and buggy desktop file check (#14)