dpkg -S /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstmicrodns.so
Then remove whatever package ships that library? You can reinstall it again after running the test. Or, if you're worried about removing it (e.g. if it's something you can't reinstall easily), maybe you can just rename libgstmicrodns.so out of the way and test?
-- Richard