Include <guiddef.h> instad of <initguid.h>

<initguid.h> defines INITGUID (both in the Windows SDK and MinGW) and
then includes <guiddef.h>. We want to define INITGUID ourselves, in
just one place (dllentry.cxx).

embedserv/source/inc/embservconst.h

@@ -29,7 +29,7 @@
 #ifndef _EMBSERVCONST_H_
 #define _EMBSERVCONST_H_
 
-#include <initguid.h>
+#include <guiddef.h>
 
 #ifndef _COMPHELPER_CLASSIDS_HXX
 #include <comphelper/classids.hxx>