aya/xtask
Tamir Duberstein 5732b2c203 test-distro: build without cross toolchain
Make the xz2 dependency optional to allow building without a C cross
compiler. This allows clippy.sh to be used on e.g. macOS more easily:

```
./clippy.sh --target x86_64-unknown-linux-gnu --exclude-features xz2
```
..
libbpf@20ea95b450 xtask: Generate new bindings
public-api aya-obj, aya-ebpf-bindings: regenerate
src test-distro: build without cross toolchain
Cargo.toml Revert "ci: download gen_init_cpio with authentication"