SSL casts the socket handle to its own copy of SocketWrapper #158

src/hx/libs/ssl/SSL.cpp and src/hx/libs/std/Socket.cpp each define a different struct SocketWrapper (only Socket.cpp's overrides __GetType), which breaks the one-definition rule, and _hx_ssl_set_socket casts any Dynamic to SSL's copy without a type check. UBSan's vptr check reports it (#148). It works only while the layouts match, and a non-socket argument crashes. Share one definition and check the handle type, as val_sock in Socket.cpp does.