splx, spllo, splhi are not portable functions.

Reference: /n/atom/patch/applied2013/fssplnotport
Date: Mon Aug 26 04:33:49 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/pc/fns.h	Mon Aug 26 04:33:29 2013
+++ /sys/src/fs/pc/fns.h	Mon Aug 26 04:33:29 2013
@@ -65,6 +65,9 @@
 int	setatapart(int, char*);
 int	setscsipart(int, char*);
 void	setvec(int, void (*)(Ureg*, void*), void*);
+int	splhi(void);
+int	spllo(void);
+void	splx(int);
 int	tas(Lock*);
 void	trapinit(void);
 void	uartspecial(int, void (*)(int), int (*)(void), int);
--- /sys/src/fs/port/portfns.h	Mon Aug 26 04:33:30 2013
+++ /sys/src/fs/port/portfns.h	Mon Aug 26 04:33:31 2013
@@ -233,9 +233,6 @@
 void	settime(Timet);
 void	sleep(Rendez*, int(*)(void*), void*);
 void	sntpinit(void);
-int	splhi(void);
-int	spllo(void);
-void	splx(int);
 int	strtouid(char*);
 int	strtoipflag(char*);
 Off	superaddr(Device*);