sysctl: Use header file for sysctl knob declarations on sparc.

This also takes care of a sparse warning as scons_pwroff's definition
point.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/system_32.h

@@ -49,6 +49,7 @@ extern unsigned long empty_zero_page;
 extern void sun_do_break(void);
 extern int serial_console;
 extern int stop_a_enabled;
+extern int scons_pwroff;
 
 static inline int con_is_present(void)
 {

arch/sparc/include/asm/system_64.h

@@ -117,6 +117,7 @@ do {	__asm__ __volatile__("ba,pt	%%xcc, 1f\n\t" \
 
 extern void sun_do_break(void);
 extern int stop_a_enabled;
+extern int scons_pwroff;
 
 extern void fault_in_user_windows(void);
 extern void synchronize_user_stack(void);

arch/sparc64/kernel/reboot.c

@@ -7,6 +7,7 @@
 #include <linux/module.h>
 #include <linux/pm.h>
 
+#include <asm/system.h>
 #include <asm/oplib.h>
 #include <asm/prom.h>
 

kernel/sysctl.c

@@ -119,9 +119,7 @@ extern int sg_big_buff;
 #endif
 
 #ifdef CONFIG_SPARC
-extern char reboot_command [];
-extern int stop_a_enabled;
-extern int scons_pwroff;
+#include <asm/system.h>
 #endif
 
 #ifdef __hppa__