This fixes bugs/weird_squashfs.sort_entries.

We need to keep the tsocks package installed since ttdnsd needs its library, but
we drop the `/usr/bin/tsocks` binary so that users stop complaining about it not
being well configured.

This reverts commit 311be6cf.

lsb-printing depends on lsb-core, which depends on a few packages we probably
don't want to ship. Looks like we need to go on installing lsb-printing
dependencies by hand, and update the list thereof when we move to Wheezy.

Until then, our APT pinning made packages from there disregarded in favor of
older Squeeze ones.

Incidentally, this also used to break the build,
since lsb-printing depends on "at",
and the current sid kernel conflicts with Squeeze's "at", but does not conflict
with squeeze-updates' "at".

We already get all its dependencies in by other means,
but installing this meta-package ensures this remains true.

This saves 12MiB in the (uncompressed) chroot.

Run this as late as possible to avoid the unwanted packages removal step to
later delete documentation that is shared with packages we want to keep.

Ignore timestamps in the process.

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