Mathopd Patch

Patch to Avoid IPv4-mapped IPv6 Addresses

Mathopd 1.6, in beta status at this writing, supports IPv6 but it uses IPv4-mapped IPv6 addresses when runs on a dual stack host. This patch makes Mathopd use separate sockets for IPv4 and IPv6 and avoid mapped addresses.

No-mapped-address patch for Mathopd 1.6b12.