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

[wine] / dlls / comcat / comcat.spec

@ stdcall -private DllCanUnloadNow() COMCAT_DllCanUnloadNow
@ stdcall -private DllGetClassObject(ptr ptr ptr) COMCAT_DllGetClassObject
@ stdcall -private DllRegisterServer() COMCAT_DllRegisterServer
@ stdcall -private DllUnregisterServer() COMCAT_DllUnregisterServer