Detect merlin installed via bash on windows about vscode-reasonml

Apparently vscode for linux can now be launched directly from within the linux subsystem for windows. I have not tried it yet but if it works then that is probably a better solution since all of the rest of the ocaml tooling will work too without additional effort.

To follow up on this, vscode (for Linux) does not launch correctly under the WSL. The problem is not specific to vscode: chrome doesn't work under WSL yet and thus no electron apps work either.

I don't think I'm going to spend time on this because there are too many issues trying to integrate the Windows version of vscode with stuff installed under Bash for Windows, given the filesystem differences, etc. I might be convinced otherwise if someone really needs it and can make a compelling argument.

Otherwise, the better solution is to use Hyper-V + Xpra (RGB/lz4) and run vscode in a minimal Linux VM.