Fix IRichEditOleCallback compilation with MinGW.

MinGW headers declare the IRichEditOleCallback interface and the
corresponding IID, but the libraries don't contain the latter symbol.
Work around it by defining it ourselves.

Fixes #16340.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76771 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/textctrl.cpp

@@ -79,6 +79,25 @@ static wxDropTarget *
 
 #endif // wxUSE_DRAG_AND_DROP && wxUSE_RICHEDIT
 
+#if wxUSE_OLE
+// 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
+// above.
+#include <initguid.h>
+
+namespace
+{
+
+// Normally the IRichEditOleCallback interface and its IID are defined in
+// richole.h header file included in the platform SDK but MinGW doesn't
+// have the IID symbol (but does have the interface). Work around it by
+// defining it ourselves.
+DEFINE_GUID(wxIID_IRichEditOleCallback,
+    0x00020d03, 0x0000, 0x0000, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
+
+} // anonymous namespace
+#endif // wxUSE_OLE
+
 // ----------------------------------------------------------------------------
 // private classes
 // ----------------------------------------------------------------------------
@@ -187,7 +206,7 @@ private:
 
 BEGIN_IID_TABLE(wxTextCtrlOleCallback)
     ADD_IID(Unknown)
-    ADD_IID(RichEditOleCallback)
+    ADD_RAW_IID(wxIID_IRichEditOleCallback)
 END_IID_TABLE;
 
 IMPLEMENT_IUNKNOWN_METHODS(wxTextCtrlOleCallback)