[compiler-rt] [compiler-rt][asan] Add wcscpy/wcsncpy; enable wcscat/wcsncat on Windows (PR #160493)

[Thurston Dang via llvm-commits]

thurstond wrote:

> @thurstond Could you please re-run CI for this PR? If anything else shows up, I’ll follow up quickly.

I've re-run it. Some minor formatting nits: https://github.com/llvm/llvm-project/actions/runs/18042370940/job/51521406858?pr=160493

https://github.com/llvm/llvm-project/pull/160493