dwrite.h: Add missed parenthesis

This commit partially fixes compilation of a C code module which
#include's dwrite.h.  One still can't compile such modules successfully
because some classes in dwrite.h declare overloaded member functions.

No functional changes intended.

Signed-off-by: ‡Ruslan Garipov <ruslanngaripov@gmail.com>
Signed-off-by: Liu Hao <lh_mouse@126.com>

mingw-w64-headers/include/dwrite.h

diff --git a/mingw-w64-headers/include/dwrite.h b/mingw-w64-headers/include/dwrite.h
index 9a0cc02..943cd73 100644
--- a/mingw-w64-headers/include/dwrite.h
+++ b/mingw-w64-headers/include/dwrite.h
@@ -1430,7 +1430,7 @@
     STDMETHOD_(ULONG, Release)(THIS) PURE;
 
     /* IDWriteFontFileLoader methods */
-    STDMETHOD(CreateStreamFromKey(THIS_ const void *fontFileReferenceKey,UINT32 fontFileReferenceKeySize,IDWriteFontFileStream **fileStream) PURE;
+    STDMETHOD(CreateStreamFromKey)(THIS_ const void *fontFileReferenceKey,UINT32 fontFileReferenceKeySize,IDWriteFontFileStream **fileStream) PURE;
 #endif
 
     /* IDWriteLocalFontFileLoader methods */