include: Add IClientSecurity constants.

include/objidl.idl

@@ -1950,6 +1950,9 @@ interface IClientSecurity : IUnknown
     void *pAuthInfo;
   } SOLE_AUTHENTICATION_INFO;
 
+  const OLECHAR *COLE_DEFAULT_PRINCIPAL = /*(OLECHAR*)*/ -1;
+  const void *COLE_DEFAULT_AUTHINFO = /*(void*)*/ -1;
+
   typedef struct tagSOLE_AUTHENTICATION_LIST {
     DWORD cAuthInfo;
     SOLE_AUTHENTICATION_INFO *aAuthInfo;