fix: bootstrap uses the directory of the latest includes available under `llvm_install_dir` for `--stdlib-includes`#976

alandefreitas merged 2 commits intocppalliance:developcppalliance/mrdocs:developfrom

gennaroprota:fix_stdlib_includes_for_clang_22gennaroprota/mrdocs_fork:fix_stdlib_includes_for_clang_22Copy head branch name to clipboard