[llvm] [BOLT][NFC] Using target_triple in lit config (PR #144078)

[Paschalis Mpeis via llvm-commits]

================
@@ -1,4 +1,4 @@
-host_linux_triple = config.target_triple.split("-")[0] + "-unknown-linux-gnu"
----------------
paschalis-mpeis wrote:

> It's not a priority for us, but allowing building BOLT and running its test suite on Mac or Windows is a nice feature to have.

That is fair and sounds better than having nothing. How about the latest patch?
It makes it more explicit that non-linux hosts (apple, windows) are forced to a linux triple.

https://github.com/llvm/llvm-project/pull/144078