Remove empty function declaration

src/lua/socket.h

@@ -45,8 +45,6 @@ lbox_socket_local_resolve(const char *host, const char *port,
 			  struct sockaddr *addr, socklen_t *socklen);
 int
 lbox_socket_nonblock(int fh, int mode);
-int bsdsocket_sendto(int fh, const char *host, const char *port,
-		     const void *octets, size_t len, int flags);
 
 #if defined(__cplusplus)
 } /* extern "C" */