Fix build (missing #include in sim build).

Change-Id: I8691db582f2d2d926da308a813d9f1864bedcd6d
diff --git a/libcore/luni/src/main/native/java_net_NetworkInterface.cpp b/libcore/luni/src/main/native/java_net_NetworkInterface.cpp
index bf2c89d..724e988 100644
--- a/libcore/luni/src/main/native/java_net_NetworkInterface.cpp
+++ b/libcore/luni/src/main/native/java_net_NetworkInterface.cpp
@@ -18,6 +18,7 @@
 #include "AndroidSystemNatives.h"
 #include "JNIHelp.h"
 #include "jni.h"
+#include "ScopedFd.h"
 
 #include <errno.h>
 #include <netinet/in.h>