In dmake jfreereport build system an intermediate directory classes was used.
All artefacts that created during build were copied there, including external
apache-commons-logging.jar. Finally java system property was used -Dlib=classes.

In gbuild we don't want to mess with copying artefacts around.
The artefacts are packaging in $(OUTDIR)/bin and java system
property points to -Dlib=$(OUTDIR)/bin. However the dependencies must
be set inside jfreereport module, because of jar interdependency:
liblayout depends on other jars and flow-engine depends on liblayout.
This is achived with new function gb_ExternalProject_use_packages.

Special treatment is necessary when system apache-commons library is used,
in which case it is not reside in $(OUTDIR)/bin, but in
/usr/share/java/commons-logging.jar or in custom location. For that
purpose the both patches: flow-engine.patch and liblayout.patch were extended
and new java system property was introduced -Dcommons-logging.jar and passed
to the build.xml. A dependency from liblayout to apache-commons-logging is set.

jfreereport was moved to tail_build module.

Change-Id: I32e39bb5f4f825f182c3bd3cfc1a13ea1c38321e
Reviewed-on: https://gerrit.libreoffice.org/761Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Tested-by: Norbert Thiebaud <nthiebaud@gmail.com>