[xml/sgml-pkgs] Bug#690047: libxml2: Add simple autopkgtest to the package

[Daniel Holbach]

Jenkins showed that pkg-config was not pulled in by installing
libxml2-dev. Personally I think it might make sense to add it as a
depends, but I don't want to make the decision for the package
maintainer. Instead I made sure that it is installed for the test.

Updated patch attached.
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