scripts.

If the socket is not close()ed, it results in a socket descriptor leak, and on
*nix systems, FD_SET() may corrupt memory outside of the fd_set if a socket
descriptor higher than FD_SETSIZE is set.

This manifested itself via ircd.js which called connect() to servers, but never
called close().  After many hours, the next socket descriptor was higher than
1024 (default FD_SETSIZE), and resulted in corruption of the private data pointer
in js_socket.c:js_connect()... which in turn resulted in a crash.