Fix detection whether the system is big endian

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 70586bffe5)

dcopc/marshal.c

@@ -19,6 +19,7 @@ AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
+#include "config.h"
 #include "marshal.h"
 
 #include <glib.h>