Handle wParam in WM_PAINT properly: if non-null, it is the hdc we are

[wine] / dlls / itss / itss.spec

@ stdcall -private DllCanUnloadNow()
@ stdcall -private DllGetClassObject(ptr ptr ptr)
@ stub DllInstall
@ stdcall -private DllRegisterServer()
@ stub DllUnregisterServer