Find workaround for WASI's fd_readdir unsupported on NodeJS@Windows

[fzhinkin]

NodeJs does not implement WASI's fs_readdir on Windows: https://github.com/nodejs/node/blob/6f4d6011ea1b448cf21f5d363c44e4a4c56ca34c/deps/uvwasi/src/uvwasi.c#L19

We need to somehow work around the lack of support to allow file listing on Windows.

[lppedd]

Did you manage to find an issue/PR that describes the why? This feels so strange.

[fzhinkin]

The top-level issue, I guess, would be: nodejs/uvwasi#11

[fzhinkin]

Although it doesn't explicitly mention an actual reason.

[lppedd]

Damn that's old... Doesn't look good long term.

[fzhinkin]

Things are not that bad in the long term, I believe.

uvwasi uses telldir and seekdir to correctly support cookie parameter in WASI 0.1's fd_readdir. Neither of these functions is available on Windows.

It's possible to somehow emulate these functions on Windows, but I don't think it's worth as WASI 0.2 replaced fd_readdir with a directory stream that provides only sequential access to its entries.

So the problem should gone as soon as WASI 0.2+ will be supported.