clock.c: make clock_10ms() and clock_250ms() static.

These shouldn't be called by outside code, use clock() instead.
Surprisingly, this saves another 12 bytes binary size.

clock.c

@@ -22,7 +22,7 @@
 
 	called from clock_10ms(), do not call directly
 */
-void clock_250ms() {
+static void clock_250ms() {
 	#ifndef	NO_AUTO_IDLE
 	if (temp_all_zero())	{
 		if (psu_timeout > (30 * 4)) {
@@ -67,7 +67,7 @@ void clock_250ms() {
 
 	called from clock(), do not call directly
 */
-void clock_10ms() {
+static void clock_10ms() {
 	// reset watchdog
 	wd_reset();
 

clock.h

@@ -1,8 +1,6 @@
 #ifndef	_CLOCK_H
 #define	_CLOCK_H
 
-void clock_250ms(void);
-void clock_10ms(void);
 void clock(void);
 
 #endif	/* _CLOCK_H */