AIX: change BPF_ALIGNMENT to usize

[xingxue-ibm]

Description

AIX header net/bpf.h defines BPF_ALIGNMENT as sizeof(int) which is size_t instead of c_ulong.

Checklist

• Relevant tests in libc-test/semver have been updated
• Commit messages permalink to headers for added or changed API
• Placeholder or unstable values like *LAST or *MAX have the standard
  doc comment
• Tested locally (cargo test -p libc-test --target mytarget);
  especially relevant for platforms that may not be checked in CI

@rustbot label +stable-nominated

[xtqqczze]

AIX header net/bpf.h

@xingxue-ibm We usually include permalinks to headers in commit messages for API changes, but I guess AIX headers are not publicly available?

[xingxue-ibm]

AIX header net/bpf.h

@xingxue-ibm We usually include permalinks to headers in commit messages for API changes, but I guess AIX headers are not publicly available?

Right, unfortunately IBM does not publish a complete, browsable full-text repository of all AIX system header files directly online. Below is the relevant definition from the AIX net/bpf.h.

 ...
 86 #ifndef _H_BPF
 87 #define _H_BPF
 88 #define BPF_ALIGNMENT sizeof(int)
 ...

[tgross35]

LGTM with a squash, thanks!

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