[singlejar] Use Win32 API directly in OutputJar::AppendFile `pread` is only used by `OutputJar::AppendFile`. Implementing `OutputJar::AppendFile` directly with Win32 API means better performance and no worry about whether `pread` polyfill follows POSIX spec correctly. Also remove unused `pread` polyfill. See #2241 Closes #6021. PiperOrigin-RevId: 210714886
{Fast, Correct} - Choose two
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