Revert "Testing build with no v6"

This reverts commit ea23d23b014a750c5efbc632806d223d0fc77398.

roles/netbootxyz/files/ipxe/local/general.h

@@ -6,7 +6,7 @@
 #define IMAGE_GZIP            /* GZIP image support */
 #define IMAGE_PNG             /* PNG image support */
 #define IMAGE_ZLIB            /* ZLIB image support */
-#undef  NET_PROTO_IPV6        /* IPv6 protocol */
+#define NET_PROTO_IPV6        /* IPv6 protocol */
 #define NSLOOKUP_CMD          /* DNS resolving command */
 #define NTP_CMD               /* NTP commands */
 #define PARAM_CMD             /* Form parameter commands */