Modify CMakeLists.txt

libxxusb.dll pdcurses.dll pthreadVC2.dll will be copied to cmake build direcotry,so that the ccudaq.exe can be run without complaining "can't find dlls".
Users still need to install libusb-win32 in his target PC(device driver),so that libusb0.dll are copied into system dir and ccudaq.exe can find it at run-time.