[compiler-rt] [compiler-rt][profile] Use `flock` shim on Windows even if detection fails (PR #112695)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

I think this change looks reasonable - the referenced commit https://github.com/llvm/llvm-project/commit/d4efc3e097f40afbe8ae275150f49bb08fc04572 is so large that it's hard to pick out all the various details that happen in there though. But it looks correct to me.

https://github.com/llvm/llvm-project/pull/112695