Added 64-bit file support to emscripten

[Joshua Minter]

We were removing a bunch of custom changes in Emscripten and noticed that out of all of them, 64-bit file support (in particular llseek) still isn't supported in Emscripten, even though we aren't the only ones that want this feature (eg. #5250). So we have upstreamed this to a PR for Emscripten at #8759.

Notably, we added an extra setting called LARGE_FILESYSTEM which when enabled will allow for seeks larger than the 2^32 limit. Due to still using JavaScript doubles, however, it still has a hard 2^53 limit to prevent weird errors to do with double accuracy. No other places were found that required changes for this support and nothing was found in the documents specifically specifying a 32-bit limit, however a test case has been added.

 We hope that you accept these changes into the main repo :)

[Alon Zakai]

Thanks for the PR!

- Alon

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