Fix wrong byte order of --dns server

We already fixed it in commit 82fd89a, but
the fix got lost in 2dfc4f8.

tuntap_options require host byte order, and we store
dns servers in struct dns_server in network byte order,
what we got from getaddrinfo().

Fix (again) by converting to the host byte order.

Change-Id: I37ca672f05e9d77ec586fa28dadc6dc752e574fb
Signed-off-by: Lev Stipakov <lev@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20250731152912.21826-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg32460.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>

Author: lstipakov

src/openvpn/options.c

@@ -3573,7 +3573,7 @@ tuntap_options_postprocess_dns(struct options *o)
             {
                 if (s->addr[i].family == AF_INET && tt->dns_len + 1 < N_DHCP_ADDR)
                 {
-                    tt->dns[tt->dns_len++] = s->addr[i].in.a4.s_addr;
+                    tt->dns[tt->dns_len++] = ntohl(s->addr[i].in.a4.s_addr);
                 }
                 else if (tt->dns6_len + 1 < N_DHCP_ADDR)
                 {