[llvm] Add llvm-dlltool to the toolchain list (PR #72563)

[Tobias Hieta via llvm-commits]

tru wrote:

I don't mind this. @zmodem ?

I also think maybe we should have an optional package with the full suite of tools and libraries. We get a lot of questions about it. 

https://github.com/llvm/llvm-project/pull/72563