[compiler-rt] CompilerRT: Normalize COMPILER_RT_DEFAULT_TARGET_TRIPLE (PR #88835)

[YunQiang Su via llvm-commits]

wzssyqa wrote:


> 
> * Achieve the original goals of this PR?

Yes. The previous is wrong due to I misunderstood `-print-effective-triple`.

> * Work for the Windows builds?

I will file a new PR. And add Martin as reviewer.

https://github.com/llvm/llvm-project/pull/88835