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

[dokyungs]

Summary

This patch fixes sanitizer-windows build errors.

[hctim]

LGTM

[morehouse]

LGTM

compiler-rt/lib/fuzzer/FuzzerLoop.cpp

 //===- FuzzerLoop.cpp - Fuzzer's main loop --------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // Fuzzer's main loop.
 //===----------------------------------------------------------------------===//
 
 #include "FuzzerCorpus.h"
 #include "FuzzerIO.h"
 #include "FuzzerInternal.h"
 #include "FuzzerMutate.h"
+#include "FuzzerPlatform.h"
 #include "FuzzerRandom.h"
 #include "FuzzerTracePC.h"
 #include <algorithm>
 #include <cstring>
 #include <memory>
 #include <mutex>
 #include <set>
 

compiler-rt/lib/fuzzer/FuzzerSHA1.cpp

 //
 // lib/Fuzzer can not use SHA1 implementation from openssl because
 // openssl may not be available and because we may be fuzzing openssl itself.
 // For the same reason we do not want to depend on SHA1 from LLVM tree.
 //===----------------------------------------------------------------------===//
 
 #include "FuzzerSHA1.h"
 #include "FuzzerDefs.h"
+#include "FuzzerPlatform.h"
 
 /* This code is public-domain - it is based on libcrypt
  * placed in the public domain by Wei Dai and other contributors.
  */
 
 #include <iomanip>
 #include <sstream>
 #include <stdint.h>