Bug#542588: source dep version limitation

[Robert Collins]

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package: plexus-build-api
version: 0.0.4-2

The source deb in plexus-build-api for libplexus-utils-java is
unversioned, but it won't build with 1:1.4.8-1 - I don't know quite what
newer version is needed, but it should be listed. Doing this will help
with backports amongst other uses.
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