added redhat/fedora infos to INSTALL
added redhat/fedora infos to INSTALL

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