Intermittent, random 'file not found' errors under Windows Subsystem for Linux (WSL)

This has been identified as a multithreading bug (https://docs.microsoft.com/en-us/windows/wsl/release-notes#build-17655-skip-ahead) and should get fixed in a future windows update.

Since it's a multithreading bug, it might be possible to work around it by not using multithreaded builds.

If in a hurry, it might be possible to just get to the windows insider program and use one of the preview builds.