turn on extended Clang warnings on Windows too

Plus some small rearrangements of the various warning lists.

Change-Id: Ied58f940341d69ddab971a529fd01b1e96b65641
Reviewed-on: https://skia-review.googlesource.com/67720
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/src/utils/win/SkDWriteFontFileStream.h b/src/utils/win/SkDWriteFontFileStream.h
index 680b3ab..bdc66c7 100644
--- a/src/utils/win/SkDWriteFontFileStream.h
+++ b/src/utils/win/SkDWriteFontFileStream.h
@@ -23,7 +23,7 @@
 class SkDWriteFontFileStream : public SkStreamMemory {
 public:
     explicit SkDWriteFontFileStream(IDWriteFontFileStream* fontFileStream);
-    virtual ~SkDWriteFontFileStream();
+    ~SkDWriteFontFileStream() override;
 
     size_t read(void* buffer, size_t size) override;
     bool isAtEnd() const override;