Add QNX support

[BunnySakura]

basesocket.hpp

#if defined(__linux__) || defined(__APPLE__) || defined(__QNX__)
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <netdb.h>
#elif _WIN32
#include <winsock32.h>
#endif

diffdefined(__QNX__)

[MagicKim]

Does it support qnx system?

[BunnySakura]

Does it support qnx system?它支持qnx系统吗？

是的，起码在我所用的QNX系统中有效工作。😊
Yes, at least it works effectively in the QNX system I use.