Building with bindgen feature fails with recent kernel headers.

[plugwash]

When I run "cargo test --all --all-targets --features bindgen" in a Debian sid environment I get.

error[E0560]: struct `io_uring_buf_reg` has no field named `pad`
   --> src/submit.rs:444:13
    |
444 |             pad: 0,
    |             ^^^ `io_uring_buf_reg` does not have this field
    |
    = note: available fields are: `ring_addr`, `ring_entries`, `bgid`, `flags`, `resv`

error[E0560]: struct `io_uring_buf_reg` has no field named `pad`
   --> src/submit.rs:464:13
    |
464 |             pad: 0,
   |             ^^^ `io_uring_buf_reg` does not have this field
   |
   = note: available fields are: `ring_addr`, `ring_entries`, `bgid`, `flags`, `resv`

For more information about this error, try `rustc --explain E0560`.

From some googling It looks like since linux 6.3 the field has been renamed from "pad" to "flags".

[quininer]

Fix by 0.6.1