[compiler-rt] [win/asan] Avoid warnings in compiling interception_win_test.cpp. (PR #116887)

[via llvm-commits]

bernhardu wrote:

Changes in v2:
- Removed one superfluous `#endif` - `#if SANITIZER_WINDOWS64` pair.
- checked commit with git-clang-format --diff 47ef5c4b7f85

https://github.com/llvm/llvm-project/pull/116887