Make linux file write life time hinting work

[yhr]

The life time hint fcntl takes a 64-bit unsigned int, so make sure to pass a uint64_t when doing the syscall.

See:

https://man7.org/linux/man-pages/man2/fcntl.2.html https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c75b1d9421f80f4143e389d2d50ddfc8a28c8c35

This is one of those "How did this ever work?", as Env::WriteLifeTimeHint hint is definitely not the same as an 64-bit unsigned int. What's surprising is that SetWriteLifeTimeHint does pass a valid hint from time to time.

Thanks, Hans

[yhr]

Could you have a quick look over this @ajkr ? Cheers!

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@ajkr merged this pull request in facebook/rocksdb@b8400c9fafc1efdb8b75a8459fc725225f953f95.