Revert "Enable sysprof events"
    
    Revert this change as it doesn't build on F33+: gtk3 only supports
    sysprof-3, but we only have sysprof-4 in F33.
    
    See the discussion in
    https://src.fedoraproject.org/rpms/gtk3/pull-request/6#comment-56683
    
    This reverts commit cd42a7ea0e0747a7c0fa3d2995aabeda34f109a7.