Use `appletvos` for `SDKROOT` build setting in Quick-tvOS
Use `appletvos` for `SDKROOT` build setting in Quick-tvOS

Xcode 8 claims that `appletvsimulator` is not found for the setting.

DanielAsher/Quick,phatblat/Quick,jeffh/Quick,dgdosen/Quick,phatblat/Quick,Quick/Quick,Quick/Quick,ikesyo/Quick,jeffh/Quick,mokagio/Quick,phatblat/Quick,Quick/Quick,marciok/Quick,phatblat/Quick,marciok/Quick,mokagio/Quick,mokagio/Quick,marciok/Quick,Quick/Quick,dgdosen/Quick,jeffh/Quick,ikesyo/Quick,DanielAsher/Quick,dgdosen/Quick,ikesyo/Quick