Compilation through a server vs --next

[Gama11]

To reproduce, first clone flash-debugger and start a compilation server:

> git clone https://github.com/vshaxe/flash-debugger
> cd flash-debugger
> npm install
> npx haxe --wait 7000

In a separate terminal also inside the cloned flash-debugger repo, try to compile through the server - it fails with a rather confusing error:

> npx haxe --connect 7000 build.hxml
Error: : unknown option '--haxe-version'.
Did you mean:
  --swf-version <version>  change the SWF version

Compilation through haxeshim works if there's no server involved:

> npx haxe build.hxml

The build.hxml consists of three builds separated by --next. If it's reduced to just one build (doesn't seem to matter which one), it seems to work through a server too. Most likely there are still some issues with --next support? I remember there were issues before, like #45.

This is with latest lix (15.8.9).