swift: mark broken

pkgs/development/compilers/swift/default.nix

···
   preFixup = "rm -rf $SWIFT_BUILD_ROOT $SWIFT_INSTALL_DIR";
 
   meta = with lib; {
+    broken = true;
     description = "The Swift Programming Language";
     homepage = "https://github.com/apple/swift";
     maintainers = with maintainers; [ dtzWill trepetti dduan ];