Switch from include guard to pragma once.
This pragma is so widley supported it is a defacto standard. It has the
advantage over include guards in that a unique macro identifier does not
need to be created and maintained.
Change-Id: Id12f56d9970fdfb63d45c92e428d3dbe44b2ab0e
diff --git a/inc/hf/arch.h b/inc/hf/arch.h
index fcdead1..860bbea 100644
--- a/inc/hf/arch.h
+++ b/inc/hf/arch.h
@@ -1,8 +1,5 @@
-#ifndef _ARCH_H
-#define _ARCH_H
+#pragma once
#include "hf/cpu.h"
void arch_putchar(char c);
-
-#endif /* _ARCH_H */