Support for Chibios compilation

Remove some warnings, change the include paths.

serial_link/protocol/frame_router.h

@@ -22,9 +22,17 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
+#ifndef SERIAL_LINK_FRAME_ROUTER_H
+#define SERIAL_LINK_FRAME_ROUTER_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
 #define UP_LINK 0
 #define DOWN_LINK 1
 
 void router_set_master(bool master);
 void route_incoming_frame(uint8_t link, uint8_t* data, uint16_t size);
 void router_send_frame(uint8_t destination, uint8_t* data, uint16_t size);
+
+#endif