mail/qmail: deprecate, and make my stuff fetchable

...officially.

qmail has not been maintained for years, and has been
unfetchable with default port options for long;
PR 254648 has been unanswered in a year -> Deprecate.

While this non-C99 conforming C89 software museum lasts,
make my own patch fetchable by placing the qmail/ dir
into our dist network. bdrewery@ had cached a copy of it.