Introduce SEN macro

* syscall.c (SEN): New temporary macro.
* linux/dummy.h (sys_printargs): New macro.
* linux/subcall.h: Wrap all sys_func entries using SEN.
* linux/*/syscallent*.h: Likewise.
diff --git a/linux/dummy.h b/linux/dummy.h
index 0c2c682..a831d40 100644
--- a/linux/dummy.h
+++ b/linux/dummy.h
@@ -115,6 +115,7 @@
 #define	sys_inotify_init	printargs
 #define	sys_munlockall		printargs
 #define	sys_pause		printargs
+#define	sys_printargs		printargs
 #define	sys_rt_sigreturn	printargs
 #define	sys_sched_yield		printargs
 #define	sys_setsid		printargs