Reroute all socket and connect through the nonce implemenation in assuan-socket.c.

2011-02-03 Marcus Brinkmann <marcus@g10code.com>

• assuan-socket.c (_assuan_sock_new): Call _assuan_socket instead of socket. (_assuan_sock_connect): Call _assuan_connect instead of connect.
• assuan-socket-connect.c (assuan_socket_connect): Call _assuan_sock_new and _assuan_sock_connect instead of _assuan_socket and assuan_connect.
• src/system-w32.c, src/system-w32ce.c (assuan_socket): Call socket instead of _assuan_sock_new. (assuan_connect): Call connect instead of _assuan_sock_connect.