This optional update for llvm15 fixes the following issues:

- Add missing LLVM 15 binary packages to Package Hub 15 SP5 (bsc#1217091)
  * clang15-devel
  * clang15-doc
  * libclang13
  * llvm15
  * llvm15-devel
  * llvm15-doc
  * llvm15-gold
  * llvm15-opt-viewer
  * llvm15-polly
  * llvm15-polly-devel
  * llvm15-vim-plugins
  * libomp15-devel
  * libLTO15