Add missing <sys/sysmacros.h> include

Was throwing:

call to undeclared function 'makedev'; ISO C99 and later do not support
implicit function declarations

libraries/YarpPlugins/RaspiOnePwmMotorController/mailbox.c

@@ -35,6 +35,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <sys/mman.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 
 #include "mailbox.h"