Only needed when using OSGi apparently:  https://github.com/sbt/sbt-osgi/blob/master/src/main/scala/com/typesafe/sbt/osgi/SbtOsgi.scala#L41

We should open a ticket against sbt-osgi about not using the appropriate `resources in Compile` key.  I think, even now, this is only *accidentally* fixing the issue.   Doing a few `inspect tree` commands around the scala-xml build leads me to think the current architecture of sbt-osgi is leading to subtle, odd, issues in how to wire things like this.

Basically, this should NOT be needed.  It represents a bug that is.  You should a comment to that effect in this file *and* I'll try to follow up on a fix.