pc version of halthi

Reference: /n/atom/patch/applied2013/fspchalthi
Date: Sat Sep 14 21:11:19 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/pc/fns.h	Sat Sep 14 21:11:05 2013
+++ /sys/src/fs/pc/fns.h	Sat Sep 14 21:11:06 2013
@@ -20,6 +20,7 @@
 int	getfields(char*, char**, int, int, char*);
 void	i8042a20(void);
 void	i8042reset(void);
+#define	halthi()	idle()
 void	idle(void);
 int	inb(int);
 ulong	inl(int);