[libFuzzer] Fix compilation error by including missing platform macro definitions.

Summary: This patch fixes sanitizer-windows build errors.

Reviewers: morehouse, hctim

Reviewed By: morehouse, hctim

Subscribers: #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D83823

GitOrigin-RevId: 750369e2e8cb318d29693eaae1e2dc38aa535917
2 files changed