fix: fix cygwin symlink

[zdm]

Under cygwin environment ln -s works incorrectly and creates full copy instead of a symbolic link.
This patch fix this problem by using Windows mklink command to create directory junction.

[zdm]

Also .editorconfig was fixed, off value is not allowed by the specification and was replaced with unset.

[ljharb]

Can you link to where false and off aren't specified, and unset is mandated?

[ljharb]

This will need a regression test, that would have failed without the fix.

[ljharb]

Suggested change

	;;
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[zdm]

https://editorconfig.org/

You can see list of allowed values there. Aslo there is common special value unset;

Currently all properties and values are case-insensitive. They are lowercased when parsed. Generally, if a property is not specified, the editor settings will be used, i.e. EditorConfig takes no effect on that part. For any property, a value of unset is to remove the effect of that property, even if it has been set before. For example, add indent_size = unset to undefine indent_size property (and use editor default).

[zdm]

I will close this PR, absolutely have no time to finish it.

[ljharb]

That’s very unfortunate you deleted the fork; now nobody else can finish it for you.

[zdm]

Oh, I am sorry. Usually PRs are not needed by anybody ;-)
In any case patch is viewable in the PR's changed files, you still can apply it if you want.