dwrite: Avoid redefining the DWRITE_GLYPH_RUN typedef.

include/d2d1.idl

@@ -37,7 +37,10 @@ interface IDWriteTextLayout;
 interface IWICBitmapSource;
 interface IWICBitmap;
 
+cpp_quote("#ifndef __dwrite_h__")
+/* already defined in dwrite.h but needed for WIDL */
 typedef struct DWRITE_GLYPH_RUN DWRITE_GLYPH_RUN;
+cpp_quote("#endif /* __dwrite_h__ */")
 
 typedef D2D_POINT_2F D2D1_POINT_2F;
 typedef D2D_MATRIX_3X2_F D2D1_MATRIX_3X2_F;

include/dwrite.idl

@@ -382,7 +382,11 @@ typedef struct DWRITE_TRIMMING
     UINT32 delimiterCount;
 } DWRITE_TRIMMING;
 
-typedef struct DWRITE_GLYPH_RUN
+cpp_quote("#ifndef __d2d1_h__")
+typedef struct DWRITE_GLYPH_RUN DWRITE_GLYPH_RUN;
+cpp_quote("#endif /* __d2d1_h__ */")
+
+struct DWRITE_GLYPH_RUN
 {
     IDWriteFontFace* fontFace;
     FLOAT fontEmSize;
@@ -392,7 +396,7 @@ typedef struct DWRITE_GLYPH_RUN
     DWRITE_GLYPH_OFFSET const* glyphOffsets;
     BOOL isSideways;
     UINT32 bidiLevel;
-} DWRITE_GLYPH_RUN;
+};
 
 typedef struct DWRITE_GLYPH_RUN_DESCRIPTION
 {