fixed Sky platform for IAR compiler

platform/sky/dev/button-sensor.c

@@ -33,7 +33,12 @@
 #include "lib/sensors.h"
 #include "dev/hwconf.h"
 #include "dev/button-sensor.h"
+
+#ifdef __IAR_SYSTEMS_ICC__
+#include <msp430.h>
+#else
 #include <signal.h>
+#endif
 
 const struct sensors_sensor button_sensor;
 
@@ -44,7 +49,12 @@ HWCONF_PIN(BUTTON, 2, 7);
 HWCONF_IRQ(BUTTON, 2, 7);
 
 /*---------------------------------------------------------------------------*/
+#ifdef __IAR_SYSTEMS_ICC__
+#pragma vector=PORT2_VECTOR
+__interrupt void
+#else
 interrupt(PORT2_VECTOR)
+#endif
      irq_p2(void)
 {
   ENERGEST_ON(ENERGEST_TYPE_IRQ);