fix #4178: methods differing only by case
fix #4178: methods differing only by case

schwabe/cgeo,yummy222/cgeo,mucek4/cgeo,tobiasge/cgeo,matej116/cgeo,Bananeweizen/cgeo,lewurm/cgeo,schwabe/cgeo,samueltardieu/cgeo,yummy222/cgeo,Huertix/cgeo,rsudev/c-geo-opensource,rsudev/c-geo-opensource,vishwakulkarni/cgeo,KublaikhanGeek/cgeo,cgeo/cgeo,madankb/cgeo,Bananeweizen/cgeo,KublaikhanGeek/cgeo,auricgoldfinger/cgeo,superspindel/cgeo,superspindel/cgeo,pstorch/cgeo,xiaoyanit/cgeo,madankb/cgeo,schwabe/cgeo,pstorch/cgeo,S-Bartfast/cgeo,ThibaultR/cgeo,samueltardieu/cgeo,mucek4/cgeo,Huertix/cgeo,Bananeweizen/cgeo,cgeo/cgeo,mucek4/cgeo,kumy/cgeo,vishwakulkarni/cgeo,marco-dev/c-geo-opensource,ThibaultR/cgeo,KublaikhanGeek/cgeo,xiaoyanit/cgeo,marco-dev/c-geo-opensource,lewurm/cgeo,brok85/cgeo,tobiasge/cgeo,cgeo/cgeo,vishwakulkarni/cgeo,lewurm/cgeo,pstorch/cgeo,brok85/cgeo,samueltardieu/cgeo,auricgoldfinger/cgeo,schwabe/cgeo,SammysHP/cgeo,SammysHP/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,S-Bartfast/cgeo,brok85/cgeo,xiaoyanit/cgeo,kumy/cgeo,matej116/cgeo,ThibaultR/cgeo,superspindel/cgeo,S-Bartfast/cgeo,matej116/cgeo,marco-dev/c-geo-opensource,tobiasge/cgeo,yummy222/cgeo,kumy/cgeo,madankb/cgeo,Huertix/cgeo,SammysHP/cgeo,auricgoldfinger/cgeo