bsdextrautils: Make shlibs:Depends regular Depends

Andreas Henrikssonrequested to merge
982557-bsdextrautils-not-pre-depends into master

As described in the bug report, bsdextrautils is a normal package (not Essential: yes), so doesn't need to Pre-Depend on libraries. Thanks to Sven Joachim for a keen eye to catch this detail.

Closes: #982557

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