error writing file using haxe interp

[clemos]

see https://github.com/HaxeFoundation/haxe/issues/5672

A nice workaround would be to check for file existence / create the file before appending to it, here: https://github.com/HaxeFoundation/haxelib/blob/development/src/haxelib/client/Main.hx#L798

[ibilon]

Haxelib doesn't use interp mode anymore, so that shouldn't be a problem ;)

[clemos]

haxe-npm currently uses haxe --run haxelib.client.Main (for now) :(