Parse last line in deb file correctly by adding a newline

While merging apt-pkg and apt-inst libraries the codepath of handling
deb files in apt-pkg was adapted to use the 'old' code from apt-inst
instead of fork&exec of dpkg-deb -I. The information we get this way
forms the main part of the package stanza, but we add a few
semi-optional fields to the stanza to make it look and work more
like a stanza we got from a repository.

Just be careful with the area where these two parts touch as if,
hypothetically, we would stip all newlines around the parts,
but forget to add a newline between them later, the two lines around
the merge would stick a bit too close together forming one which could
result in fun parsing errors if this merged line was previously e.g. a
well-formed Depends line and has now extra fluff attached.

This codepath has a history with too many newlines (#802553) though,
so how likely is it really that it will some day lack one you may ask.

References: 6089a4b17c61ef30b2efc00e270b0907f51f352a

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