Rename sk_new() to avoid name collision with OpenSSL.

sysdep/unix/io.c

@@ -588,9 +588,12 @@ static struct resclass sk_class = {
  * This function creates a new socket resource. If you want to use it,
  * you need to fill in all the required fields of the structure and
  * call sk_open() to do the actual opening of the socket.
+ *
+ * The real function name is sock_new(), sk_new() is a macro wrapper
+ * to avoid collision with OpenSSL.
  */
 sock *
-sk_new(pool *p)
+sock_new(pool *p)
 {
   sock *s = ralloc(p, &sk_class);
   s->pool = p;