Re-add stat definition for Vita and 3DS (to fix compilation on main)

[pheki]

Description

Re-add stat definition for Vita and 3DS to fix compilation on main

This comment made me realize that these targets are failing on main (and I'm one of the target maintainers for armv7-sony-vita-newlibeabihf).

It seems that both were broken by #5061 becasuse of a missing re-export, but at the same time it made me realize that the new definition seems incorrect for the Vita.

VitaSDK uses its own newlib fork, with its stat defined in https://github.com/vitasdk/newlib/blob/fbb8375870d799758e0b4358d2f1708781aa26a6/newlib/libc/sys/vita/sys/stat.h#L27-L55

For horizon, that definition is the same as the old one (and libc-0.2 one), and the discussion in #2795 implies it's correct, but I'm not sure where can we find the canonical headers for it.

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

Checked locally using both ./etc/libc-util.py check-all-targets --only {target} libc and cargo +nightly check --target {target} -Z build-std=core for:

• armv7-sony-vita-newlibeabihf
• armv6k-nintendo-3ds

And TYSM for maintaining libc!

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[tgross35]

Thanks!

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