Add a readlinkat_raw function.
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This is similar to `readlinkat`, but instead of returning an owned and allocated `CString`, takes a `&mut [MaybeUninit<u8>]` and returns a `&mut [u8]` containing the written bytes, which may have been truncated. This is trickier to use, and most users should still just use `readlinkat`, but it is usable in contexts that can't do dynamic allocation.
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On some architectures, there is a `getcpu` entry in the vDSO, so use that if available, and use the syscall otherwise.
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This is similar to
readlinkat, but instead of returning an owned and allocatedCString, takes a&mut [MaybeUninit<u8>]and returns a&mut [u8]containing the written bytes, which may have been truncated. This is trickier to use, and most users should still just usereadlinkat, but it is usable in contexts that can't do dynamic allocation.