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Auto merge of #31825 - ollie27:win_lfs, r=alexcrichton
`ReadFile` and `WriteFile` take a DWORD (u32) for the length argument
which was erroneously cast from a usize causing truncation. This meant
methods like `write_all` and `read_exact` would unexpectedly fail if
given a buffer 4 GiB or larger.
We can instead just ask for `u32::MAX` bytes if the given buffer is too
big.
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