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

[gennaroprota]

I left the code as is, but we shouldn't hard-code directory names like that.

[cppalliance-bot]

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[alandefreitas]

but we shouldn't hard-code directory names like that

Exactly. Let's fix the underlying problem. Something like:

    parent = os.path.join(llvm_install_dir, "lib", "clang")
    dirs = [d for d in os.listdir(parent) if os.path.isdir(os.path.join(parent, d))]
    numeric_dirs = [d for d in dirs if d.isdigit()]
    if not numeric_dirs:
        raise RuntimeError(f"No numeric directories found in {parent}")
    clang_dir_num = max(numeric_dirs, key=lambda d: int(d))

[cppalliance-bot]

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[cppalliance-bot]

An automated preview of the documentation is available at https://976.mrdocs.prtest2.cppalliance.org/index.html