emscripten: Add in6_pktinfo struct

[guybedford]

Description

The latest Emscripten now supports proper TCP & UDP sockets in Node.js. This adds the missing struct definition that otherwise results in a build failure when using UDP sockets, due to this struct not being included in the shared headers.

Sources

• musl netinet/in.h: https://git.musl-libc.org/cgit/musl/tree/include/netinet/in.h?id=v1.2.5#n307

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

[JohnTitor]

Thanks!

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