[libFuzzer][Windows] Clean up RawPrint

Summary:
Use `_write` instead of the deprecated alias `write` on Windows.
Also, remove comment saying RawPrint is untested on Windows.

Reviewers: vitalybuka

Reviewed By: vitalybuka

Subscribers: vitalybuka

Differential Revision: https://reviews.llvm.org/D57589

llvm-svn: 353108
GitOrigin-RevId: 7c907bac6fd51835ed4410845cc25b44cdd08c95
diff --git a/FuzzerIOWindows.cpp b/FuzzerIOWindows.cpp
index 79dacd9..e45c137 100644
--- a/FuzzerIOWindows.cpp
+++ b/FuzzerIOWindows.cpp
@@ -333,8 +333,7 @@
 }
 
 void RawPrint(const char *Str) {
-  // Not tested, may or may not work. Fix if needed.
-  write(2, Str, strlen(Str));
+  _write(2, Str, strlen(Str));
 }
 
 }  // namespace fuzzer