revert pipe opening, so open() blocks again if no reader
revert pipe opening, so open() blocks again if no reader

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