v14.8.4

This is the "Nameless bird (shot by Hemingway)",

so build ourselfs a new cage, hey, it's for safety purposes..

This bird adds support for IDNA via idnkit, changes the privilege-
separated dotlock helper to a SETUID program, improves S/MIME
interoperability a bit, improves -t and *expandaddr*.  And a bit.

It fixes a severe symlink related bug *but* which only matters
on old systems without a realpath(3) function, like Solaris 9;
none of the systems that S-nail ever has been packaged for is
vulnerable, for example.

Thanks for Jérémie Courrèges-Anglas for beating me to it.
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