[compiler-rt] [win/asan] Avoid warnings in interception_win.cpp. (PR #118143)

[via llvm-commits]

https://github.com/zmodem approved this pull request.

> Hello @zmodem, does this PR also qualify for a review?

Absolutely, I just didn't see it before. Please feel free to @ me for any asan PRs you send.

https://github.com/llvm/llvm-project/pull/118143