face: enable immediate mode for packet capture on EthernetFace.

Fixes #1511

Change-Id: I6551de8d650c5d14e27713258d958ac3c77a1649
diff --git a/daemon/face/ethernet-face.hpp b/daemon/face/ethernet-face.hpp
index 381493c..805c0e0 100644
--- a/daemon/face/ethernet-face.hpp
+++ b/daemon/face/ethernet-face.hpp
@@ -25,6 +25,7 @@
 #ifndef NFD_DAEMON_FACE_ETHERNET_FACE_HPP
 #define NFD_DAEMON_FACE_ETHERNET_FACE_HPP
 
+#include "config.hpp"
 #include "ethernet.hpp"
 #include "face.hpp"