Bind to IPv4 on OpenBSD when using wildcard

OpenBSD does not support binding on both IPv4 and IPv6 using the same socket

(cherry picked from commit 619e7a2c8ba19d0dc45467e29d9d9aa8b3506ac8)

drivers/unix/packet_peer_udp_posix.cpp

@@ -127,7 +127,11 @@ Error PacketPeerUDPPosix::listen(int p_port, IP_Address p_bind_address, int p_re
 	ERR_FAIL_COND_V(sockfd != -1, ERR_ALREADY_IN_USE);
 	ERR_FAIL_COND_V(!p_bind_address.is_valid() && !p_bind_address.is_wildcard(), ERR_INVALID_PARAMETER);
 
+#ifdef __OpenBSD__
+	sock_type = IP::TYPE_IPV4; // OpenBSD does not support dual stacking, fallback to IPv4 only.
+#else
 	sock_type = IP::TYPE_ANY;
+#endif
 
 	if (p_bind_address.is_valid())
 		sock_type = p_bind_address.is_ipv4() ? IP::TYPE_IPV4 : IP::TYPE_IPV6;

drivers/unix/tcp_server_posix.cpp

@@ -74,7 +74,11 @@ Error TCPServerPosix::listen(uint16_t p_port, const IP_Address p_bind_address) {
 	ERR_FAIL_COND_V(!p_bind_address.is_valid() && !p_bind_address.is_wildcard(), ERR_INVALID_PARAMETER);
 
 	int sockfd;
+#ifdef __OpenBSD__
+	sock_type = IP::TYPE_IPV4; // OpenBSD does not support dual stacking, fallback to IPv4 only.
+#else
 	sock_type = IP::TYPE_ANY;
+#endif
 
 	// If the bind address is valid use its type as the socket type
 	if (p_bind_address.is_valid())