fixed old-style-declaration warning

board_init.c:7:1: warning: 'static' is not at beginning of declaration
[-Wold-style-declaration]

msb-430-common/board_init.c

@@ -4,7 +4,7 @@
 #include "msp430.h"
 #include "debug.h"
 
-volatile static uint32_t __msp430_cpu_speed = MSP430_INITIAL_CPU_SPEED;
+static volatile uint32_t __msp430_cpu_speed = MSP430_INITIAL_CPU_SPEED;
 
 /*---------------------------------------------------------------------------*/
 static uint8_t calc_umctl(uint16_t br) {