Fix for build problem, where older versions of automake don't like duplicate file entries. OBS-URL: https://build.opensuse.org/request/show/76292 OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/log4cxx?expand=0&rev=3
Request was accepted with message: reviewed ok. OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/log4cxx?expand=0&rev=2