Report reasons for ineligible target devices

[stackotter]

When running xcodebuild with -showdestinations, it shows available devices and ineligible devices. A common reason for ineligibility is that Xcode doesn't have a new enough platform SDK installed to support the device. It's a bit baffling as a user when Swift Bundler just shows no devices but Xcode's device manager clearly shows connected devices. Swift Bundler should parse the ineligible devices along the available ones and just remember that they're ineligible and display them as such (along with their respective reasons for being ineligible).