fix #5957: duplicate class warnings in proguard
fix #5957: duplicate class warnings in proguard

cgeo/cgeo,auricgoldfinger/cgeo,S-Bartfast/cgeo,superspindel/cgeo,Bananeweizen/cgeo,S-Bartfast/cgeo,kumy/cgeo,mucek4/cgeo,matej116/cgeo,rsudev/c-geo-opensource,auricgoldfinger/cgeo,Bananeweizen/cgeo,superspindel/cgeo,matej116/cgeo,cgeo/cgeo,tobiasge/cgeo,Bananeweizen/cgeo,pstorch/cgeo,kumy/cgeo,pstorch/cgeo,matej116/cgeo,rsudev/c-geo-opensource,mucek4/cgeo,superspindel/cgeo,auricgoldfinger/cgeo,pstorch/cgeo,tobiasge/cgeo,mucek4/cgeo,cgeo/cgeo,rsudev/c-geo-opensource,kumy/cgeo,cgeo/cgeo,S-Bartfast/cgeo,tobiasge/cgeo