Dynamic ignore patterns, part 1.
Track a wget-lua that contains the hooks we need.
A more specific wget-lua ignore pattern.
Reject queued URLs that match the active ignore set.
Temporary hack for the wget-lua check.

This will eventually check for an ArchiveBot-specific version string, or
a version string that otherwise indicates "yeah, I've got the
httploop_confirm hook".
Fetch and build Wget 1.14.0-archivebot1.
Expect Wget 1.14.0-archivebot1 in ArchiveBot's seesaw.