lost it, perhaps because CMake usually adds it on top. So when
overriding CMAKE_{C,CXX}_FLAGS_RELWITHDEBINFO, we make sure to
take over the other flags. We drop LLVM_ENABLE_ASSERTIONS=OFF,
because that's the default anyway and hasn't helped here.
- Add llvm-glibc-2-36.patch in order to address boo#1202215.
OBS-URL: https://build.opensuse.org/package/show/devel:tools:compiler/llvm13?expand=0&rev=28
