Fix compile bug on some IPv4 platforms.
Fix compile bug on some IPv4 platforms.

dotmpe/shairport,bowlofstew/shairport,hendrikw82/shairport,hendrikw82/shairport,IronBeard/shairport,narakai/shairport,IronBeard/shairport,bowlofstew/shairport,narakai/shairport,hendrikw82/shairport,dotmpe/shairport,bowlofstew/shairport,albertz/shairport,dotmpe/shairport,skaman/shairport,albertz/shairport,narakai/shairport,IronBeard/shairport,mspasov/shairport,skaman/shairport,mspasov/shairport