linux: add constant PACKET_IGNORE_OUTGOING

[ryancdotorg]

Description

This adds the SOL_PACKET option constant PACKET_IGNORE_OUTGOING, which can be used on AF_PACKET sockets to avoid receiving sent packets.

Sources

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fa788d986a3aac5069378ed04697bd06f83d3488)

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[rustbot]

r? @tgross35

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[tgross35]

Lgtm, please squash. The CI failure is unrelated (retrying)

@rustbot label +stable-nominated

[tgross35]

@rustbot author for the squash (unfortunately GH doesn't let me do that from the merge queue UI)