msmpeg2vdec: Add DllGetClassObject() stub.

dlls/msmpeg2vdec/Makefile.in

 MODULE    = msmpeg2vdec.dll
+
+C_SRCS = \
+	main.c

dlls/msmpeg2vdec/main.c

+/*
+ * Copyright (C) 2023 Mohamad Al-Jaf
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include "wine/debug.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(msmpeg2vdec);
+
+HRESULT WINAPI DllGetClassObject( REFCLSID clsid, REFIID riid, void **out )
+{
+    FIXME( "clsid %s, riid %s, out %p stub!\n", debugstr_guid(clsid), debugstr_guid(riid), out );
+    return CLASS_E_CLASSNOTAVAILABLE;
+}

dlls/msmpeg2vdec/msmpeg2vdec.spec

@@ -3,6 +3,6 @@
 @ stub ?GetSurfaceSize@CVIDEOfilter@@QEAAJHPEAJ@Z
 @ stub ?LoadSurface@CVIDEOfilter@@QEAAJHPEAEK@Z
 @ stdcall -private DllCanUnloadNow()
-@ stub DllGetClassObject
+@ stdcall -private DllGetClassObject(ptr ptr ptr)
 @ stdcall -private DllRegisterServer()
 @ stdcall -private DllUnregisterServer()