EventProducerCollectorTask does not work when executed by antrun maven plugin

If using qdox 1.12.x (as currently in trunk) this is easy to fix:

Change:
JavaDocBuilder builder = new JavaDocBuilder(this.tagFactory);
to:
JavaDocBuilder builder = new JavaDocBuilder(this.tagFactory,
new ClassLibrary(getClass().getClassLoader()));

in EventProducerCollector#scanFile(..)

This also resolves reported problems with alternate builds.

I have tested this fix with the normal ant based build and a maven build (we mavenized the project)

Ronald