Update libnotify to version 0.8.2 / rev 44 via SR 1067450
    
    https://build.opensuse.org/request/show/1067450
    by user dimstar + dimstar_suse
    - Update to version 0.8.2:
      + Set new summary for library.
      + Docs:
        - Port to gi-docgen.
        - Fix URL to Desktop Notification Spec.
      + meson:
        - Replace deprecated meson.source_root() calls.
        - Bump minimum meson version to 0.58.
      + Introspection docs fixes.
    - Following upstreams port to gi-docgen, drop gtk-doc and add
      meson, xsltproc and pkgconfig(gi-docgen) BuildRequires. Also pass
      explicit man=true to meson, ensure we are building manpages. (forwarded request 1067430 from iznogood)