Don't include <linux/...> header files directly.

These change from kernel release to release, and no longer contain some of
the stuff you need.

Change-Id: I3fc7176cf2246aebfc0aa2a833dfa04ea8d931fc
diff --git a/TetherController.h b/TetherController.h
index eef94fe..398a8e5 100644
--- a/TetherController.h
+++ b/TetherController.h
@@ -17,7 +17,7 @@
 #ifndef _TETHER_CONTROLLER_H
 #define _TETHER_CONTROLLER_H
 
-#include <linux/in.h>
+#include <netinet/in.h>
 
 #include "List.h"