lwip2: ipv6: fix udp_new() esp8266#5744 (esp8266#5752)

From: @oddstr13
(d-a-v/esp82xx-nonos-linklayer#28)

Initialize pcb->local_ip.type depending on whether we have IPv4, IPv4+IPv6 or IPv6 networking stack.

Fixes esp8266#5744
Closes esp8266#5745

Author: d-a-v

tools/sdk/lib/liblwip2-1460-feat.a

@@ -1,5 +1,5 @@
 // generated by makefiles/make-lwip2-hash
 #ifndef LWIP_HASH_H
 #define LWIP_HASH_H
-#define LWIP_HASH_STR "STABLE-2_1_2_RELEASE/glue:1.1"
+#define LWIP_HASH_STR "STABLE-2_1_2_RELEASE/glue:1.1-2-ga501b57"
 #endif // LWIP_HASH_H