[opensuse-factory] Gold

List, I propose using the gold linker as a default for Factory for C++ projects. There are some packages that might not build with it but for the most part I would imagine no significant issues. Tangible benefits: (*) Build service builds should be generally faster:- gold's sole purpose is to link faster than the gnu linker (*) LTO - gcc lto and gold linker work really well together Cons: (*) Some large projects are known to build or not build depending on version (gold bug or other project bug unknown) (*) people don't like change I spotted chromium taking advantage of gold already, where else can we leverage it to gain a few extra spare build hosts for other stuff?