privsep: Allow __NR__llseek as well as __NR_llseek on linux

[rsmarples]

I have no idea why this has an extra _
Fixes pidfile cleanup on x86 Debian Bookworm.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 39bd6316-83b3-4be8-9611-24c200b752c4

📥 Commits

Reviewing files that changed from the base of the PR and between 8d499db and 78429f5.

📒 Files selected for processing (1)

• src/privsep-linux.c

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Walkthrough

The Linux seccomp syscall allowlist now conditionally permits __NR__llseek when the syscall macro is available.

Changes

Seccomp allowlist

Layer / File(s)	Summary
Conditional __NR__llseek permission src/privsep-linux.c	The seccomp allowlist permits __NR__llseek when the macro is defined.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the syscall allowlist change for both Linux syscall identifiers.
Description check	✅ Passed	The description explains the extra underscore and identifies the pidfile cleanup fix on x86 Debian Bookworm.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nr__llseek

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