Define wxBitmapComboBox::Insert(void* clientData) overload in wxMSW.

This overload was declared in the header but not implemented, do add its
definition too.

Closes #13774.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70039 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/bmpcbox.cpp

@@ -257,6 +257,16 @@ int wxBitmapComboBox::Insert(const wxString& item,
     return n;
 }
 
+int wxBitmapComboBox::Insert(const wxString& item, const wxBitmap& bitmap,
+                             unsigned int pos, void *clientData)
+{
+    OnAddBitmap(bitmap);
+    const int n = wxComboBox::Insert(item, pos, clientData);
+    if ( n != wxNOT_FOUND )
+        DoSetItemBitmap(n, bitmap);
+    return n;
+}
+
 int wxBitmapComboBox::Insert(const wxString& item, const wxBitmap& bitmap,
                              unsigned int pos, wxClientData *clientData)
 {