eliminate SK_BUILD_FOR_WIN32

SK_BUILD_FOR_WIN and SK_BUILD_FOR_WIN32 have long meant the same thing.

Chrome fix is https://chromium-review.googlesource.com/c/chromium/src/+/884007

Change-Id: I0e907b1bcd2a358eabf776f414fd3aeb3c689561
Reviewed-on: https://skia-review.googlesource.com/99340
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/tools/OverwriteLine.h b/tools/OverwriteLine.h
index e8f0504..8985a6a 100644
--- a/tools/OverwriteLine.h
+++ b/tools/OverwriteLine.h
@@ -3,7 +3,7 @@
 
 // Print this string to reset and clear your current terminal line.
 static const char* kSkOverwriteLine =
-#ifdef SK_BUILD_FOR_WIN32
+#ifdef SK_BUILD_FOR_WIN
 "\r                                                                               \r"
 #elif defined(SK_BUILD_FOR_IOS)
 "\r"