Fix building without precompiled headers on Windows

src/msw/graphicsd2d.cpp

@@ -14,9 +14,6 @@
 // Minimum supported client: Windows 8 and Platform Update for Windows 7
 #define wxD2D_DEVICE_CONTEXT_SUPPORTED 0
 
-// Ensure no previous defines interfere with the Direct2D API headers
-#undef GetHwnd
-
 // We load these functions at runtime from the d2d1.dll.
 // However, since they are also used inside the d2d1.h header we must provide
 // implementations matching the exact declarations. These defines ensures we
@@ -36,9 +33,7 @@
     #pragma warning(disable:4458) // declaration of 'xxx' hides class member
 #endif
 
-#include <d2d1.h>
-#include <dwrite.h>
-#include <wincodec.h>
+#include "wx/msw/private/graphicsd2d.h"
 
 #ifdef __MINGW64_TOOLCHAIN__
 #ifndef DWRITE_E_NOFONT
@@ -78,7 +73,6 @@
 #include "wx/private/graphics.h"
 #include "wx/stack.h"
 #include "wx/sharedptr.h"
-#include "wx/msw/private/graphicsd2d.h"
 
 // This must be the last header included to only affect the DEFINE_GUID()
 // occurrences below but not any GUIDs declared in the standard files included