updatebuildenv: also explicitely install 2 de-facto dependencies of debdelta which are only in recommends

Those 2 are real deps, as debdelta-upgrade won't work without them, though the
maintainer thinks otherwise: https://bugs.debian.org/545831
Install them manually (since using --install-recommends would install way too
much stuff), and then mark them as automatically installed, so they will be
removed by the `apt-get autoremove` thing once debdelta's gone (but won't before
because debdelta references them someway).

Gbp-Dch: Ignore

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