Added close serial port to device_destruct in unix serial.cc
Added close serial port to device_destruct in unix serial.cc

PeterJohnson/sweep-sdk,scanse/sweep-sdk,scanse/sweep-sdk,scanse/sweep-sdk,PeterJohnson/sweep-sdk,PeterJohnson/sweep-sdk,PeterJohnson/sweep-sdk,PeterJohnson/sweep-sdk,PeterJohnson/sweep-sdk,scanse/sweep-sdk,scanse/sweep-sdk,scanse/sweep-sdk,scanse/sweep-sdk,PeterJohnson/sweep-sdk