Version 1.7 of mk/fetch/fetch broken

[Steve O'Hara-Smith <steve%sohara.org@localhost>]

        Hi,

        The latest change to mk/fetch/fetch (adding a setting of fetchdir)
seems to have broken fetch (perhaps only on DragonFly). An empty file gets
generated (no ftp transfer occurs). I haven't got to the bottom of it but
it looks like the the file is just being touched rather than being fetched.
Revertin mk/fetch/fetch to 1.6 and making no other changes makes it all
work as normal.

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