Build init as C++.

This is just the minimal change to keep it building.

Change-Id: I245c5b8413a1db114576c81462eb5737f5ffcef2
diff --git a/init/devices.h b/init/devices.h
index 5d0fe88..6cb0a77 100644
--- a/init/devices.h
+++ b/init/devices.h
@@ -26,4 +26,5 @@
                          unsigned int gid, unsigned short prefix,
                          unsigned short wildcard);
 int get_device_fd();
+
 #endif	/* _INIT_DEVICES_H */