[llvm] [llvm-readtapi] Add install-distribution support (PR #67748)

[Cyndy Ishida via llvm-commits]

cyndyishida wrote:

This may be overkill but I didn't figure out a better way to install both the tool and symlink when adding `readtapi` to `LLVM_DISTRIBUTION_COMPONENTS`

https://github.com/llvm/llvm-project/pull/67748