Build init as C++.

This is just the minimal change to keep it building.

Change-Id: I245c5b8413a1db114576c81462eb5737f5ffcef2
diff --git a/init/init.h b/init/init.h
index 654a80b..eedec27 100644
--- a/init/init.h
+++ b/init/init.h
@@ -18,6 +18,7 @@
 #define _INIT_INIT_H
 
 #include <cutils/list.h>
+#include <cutils/iosched_policy.h>
 
 #include <sys/stat.h>
 
@@ -122,7 +123,7 @@
     int nkeycodes;
     int keychord_id;
 
-    int ioprio_class;
+    IoSchedClass ioprio_class;
     int ioprio_pri;
 
     int nargs;