Update brltty to version 6.2 / rev 52 via SR 863078
    
    https://build.opensuse.org/request/show/863078
    by user olh + dimstar_suse
    - Update to version 6.2:
      + See ChangeLog for changes.
    - Update api_version: now 0.8.1.
    - Replace brltty-5.5-systemd-install.patch with
      brltty-fix-install-dirs.patch: also adjust udev directory.
    - Drop brltty-gcc10.patch: fixed upstream.
    - Move udev rules patching to %build.
    - Use the Makefile to install udev and polkit rules and docs.
    - Brltty-config has been renamed to brltty-config.sh.
    - Remove polkit conditional: we always have it enabled.
    - Remove old espeak support: Leap prior to 15.0 is no longer
      supported.
    - Add python3-setuptools to BuildRequires: required by rpm during
      checks.
    - Add doxygen to BuildRequires: needed to build manual.
    - Create a brltty user on install: now expected by service.