Check if compiler knows about modules (@import).
Check if compiler knows about modules (@import).

This should fix building for OS X < 10.8, at the expense of disabling
AppKit support on those systems.

neofob/sile,alerque/sile,neofob/sile,simoncozens/sile,neofob/sile,alerque/sile,simoncozens/sile,neofob/sile,alerque/sile,simoncozens/sile,alerque/sile,simoncozens/sile