Support 'less than' operator in compilation conditions (#877)
Support 'less than' operator in compilation conditions (#877)

* Add "Support 'less than' operator in compilation conditions" proposal

* Add implementations

* Add explanation about why supporting "<=" and ">" is not desired

rballard/swift-evolution,airspeedswift/swift-evolution,abertelrud/swift-evolution,ddunbar/swift-evolution,apple/swift-evolution,anandabits/swift-evolution,hartbit/swift-evolution,Nirma/swift-evolution,allevato/swift-evolution,natecook1000/swift-evolution,abertelrud/swift-evolution,DevAndArtist/swift-evolution,airspeedswift/swift-evolution,Nirma/swift-evolution,allevato/swift-evolution,DevAndArtist/swift-evolution,hartbit/swift-evolution,rballard/swift-evolution,ddunbar/swift-evolution,apple/swift-evolution,natecook1000/swift-evolution,anandabits/swift-evolution