[llvm] [clang] [clang-tools-extra] [mlir] [emacs] Fix Emacs library formatting (PR #76110)

[Benjamin Kramer via cfe-commits]

https://github.com/d0k approved this pull request.

I don't know anything about Emacs, but if the version field is required I see no harm in adding it.

https://github.com/llvm/llvm-project/pull/76110