[llvm] [llvm-config] Quote and escape paths (PR #97305)

[Alexandre Ganea via llvm-commits]

aganea wrote:

While we could avoid unnecessary escaping for the libraries above, escaping paths in general (like this patch does) would need some modifications (I think) in scripts using `llvm-config`.

What do you all think about adding a new flag such as `--escaped` that allows potentially quoting and escaping paths, while keeping the old behavior when the flag is not provided?

https://github.com/llvm/llvm-project/pull/97305