[ Reason ]
Fix Bug #1102314 (FTBFS due to flaky test)

[ Impact ]
Users may find that the package does not build in some cases.

[ Tests ]
I've checked that the package builds ok again on the systems where it used to fail.

[ Risks ]
Very low. No real code changes. We are merely skipping a flaky test.

[ Checklist ]
   [X] *all* changes are documented in the d/changelog
   [X] I reviewed all changes and I approve them
   [X] attach debdiff against the package in (old)stable
   [X] the issue is verified as fixed in unstable

[ Changes ]
Disable flaky test.

[ Other info ]
Change is trivial, so I've already uploaded the package.