Auto merge of #45896 - malbarbo:use-libc-const, r=alexcrichton

Use getrandom syscall for all Linux and Android targets.

I suppose we can use it in all Linux and Android targets. In function `is_getrandom_available` is checked if the syscall is available (getrandom syscall was add in version 3.17 of Linux kernel), if the syscall is not available `fill_bytes` fallback to reading from `/dev/urandom`.

Update libc to include getrandom related constants.

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