Clean up log4j-to-slf4j OSGi build.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1588798 13f79535-47bb-0310-9956-ffa450edef68
Delete empty package.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1588799 13f79535-47bb-0310-9956-ffa450edef68