Wrong jars being included in the src/ directory

./gradlew clean sourcesJars

That puts a bunch of jar files under the src/ directory. Right now those include concurrentlinkedhashmap-lru-1.2_jdk5-sources.jar and jta-1.1-sources.jar, which should not be there. Their presence in the src/ directory means that they also end up in the distribution zip under the src/ directory.

I think this started with https://github.com/grails/grails-core/commit/86087b3f9ae7e9ab50be0ddebd1ae967d46bfc92 and only happens on the master branch.