windowscodecsext: Add stub DllGetClassObject.

dlls/windowscodecsext/main.c

@@ -48,6 +48,16 @@ BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
     return TRUE;
 }
 
+/******************************************************************
+ * DllGetClassObject
+ */
+HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID iid, LPVOID *ppv)
+{
+    FIXME("(%s,%s,%p) stub\n", debugstr_guid(rclsid), debugstr_guid(iid), ppv);
+
+    return CLASS_E_CLASSNOTAVAILABLE;
+}
+
 HRESULT WINAPI WICCreateColorTransform_Proxy(IWICColorTransform **ppIWICColorTransform)
 {
     HRESULT hr, init;

dlls/windowscodecsext/windowscodecsext.spec

-@ stub DllGetClassObject
+@ stdcall -private DllGetClassObject(ptr ptr ptr)
 @ stdcall IWICColorTransform_Initialize_Proxy(ptr ptr ptr ptr ptr) IWICColorTransform_Initialize_Proxy_W
 @ stdcall WICCreateColorTransform_Proxy(ptr)