Move BREE of o.e.dltk.ruby.basicdebugger to Java 1.6 With DLTK core being at 1.6 it makes no sense to stay lower in dependent modules. Also fix a new warning appeared after that. Change-Id: I13199189f8a69f46722af547cd9c602262233b98 Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>