- Update initscript to support running the milter as root, which is needed
        for the -x (expand aliases) option; note that the milter does not run
        as root by default
    - Add patch for popen unsanitized input vulnerability (#572117, #572119,
        https://savannah.nongnu.org/bugs/?29136)
    - Rebase authuser patch
    - Update patch adding auth info to dummy Received-header so that it doesn't
        generate spurious warnings about missing macros (#532266), and update
        and merge the macro documentation patch into this patch
    - Document patch usage in spec file