Update llvm13 to version 13.0.1 / rev 14 via SR 1086803
    
    https://build.opensuse.org/request/show/1086803
    by user aaronpuchert + dimstar_suse
    - Don't use gold for linking anymore: on s390x we use ld.bfd with
      LLVMgold.so, on ppc64 we disable ThinLTO for now. (boo#1210688)
    - Using ld.bfd on s390x exposed an issue with the existing
      llvm_build_tablegen_component_as_shared_library.patch: linking
      llvm-tblgen with libLLVM.so means we also have to link libraries
      used for that (like LLVMTableGenGlobalISel) with libLLVM.so.
    - Rewrite summary and description for llvm-gold to point out that
      it can also be used with ld.bfd, recommend with binutils.