Incorrect integer casts for some Windows APIs

[ollie27]

In a few places in std there are casts from usize to u32 or i32 for Windows APIs which causes breakage on 64-bit.

Some examples I have found so far:

• Files/Pipes (Fix reading/writing 4 GiB or larger files on Windows 64-bit #31825)
• Networking (std: Cap read/write limits on Windows networking #31858)
• Rand (Fix filling buffers 4 GiB or larger with OsRng::fill_bytes on Windows rust-random/rand#99, rand: Fix OsRng::fill_bytes on Windows #31876)

There may be more.

[ollie27]

Well I didn't find any more so I'll close this.