Mis-placed extern "C" in board.h

Fix #446

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

Diff for: cores/arduino/board.h

@@ -5,9 +5,6 @@
  * Core and peripherals registers definitions
 */
 #include "interrupt.h"
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
 #include "analog.h"
 #include "clock.h"
 #include "core_callback.h"
@@ -21,8 +18,11 @@ extern "C" {
 #include "twi.h"
 #include "uart.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
 void init(void) ;
 #ifdef __cplusplus
 }
-#endif // __cplusplus
+#endif /* __cplusplus */
 #endif /* _BOARD_H_ */