Commit e55dda6
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Rollup merge of rust-lang#128655 - joboet:play_with_the_dice, r=ChrisDenton
std: refactor UNIX random data generation
This PR makes a number of changes to the UNIX randomness implementation:
* Use `io::Error` for centralized error handling
* Move the file-fallback logic out of the `getrandom`-specific module
* Stop redefining the syscalls on macOS and DragonFly, they have appeared in `libc`
* Add a `OnceLock` to cache the random device file descriptor1 file changed
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