Fixed test_nested_libs_will_be_flattened to use File::PATH_SEPARATOR
Fixed test_nested_libs_will_be_flattened to use File::PATH_SEPARATOR

pjump/rake,mat/rake,Vanzct/rake,envato/rake,envato/rake,esasse/rake,ipmobiletech/rake,hsbt/rake,88rabbit/rake,tmornini/rake,bentley/rake,askl56/rake,codedogfish/rake,jaustinhughey/rake,ruby/rake,utilum/rake,mat/rake,hsbt/rake,zzak/rake,taiganakagawa/rake,ruby/rake