build: fix the configure.ac USDT check for armhf platform

[natoscott]

Ensure the target_cpu now injected through the correction to configure.ac handling in Debian builds (via commit 704b93c) matches with what configure.ac USDT check is looking for.

Resolves Debian bug #1133063

Summary by CodeRabbit

• Bug Fixes
  • Fixed detection of static USDT probes on ARM platforms, restoring/enabling USDT support on ARM-based systems (including armhf).
  • This improves performance monitoring and tracing reliability on affected ARM deployments.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: e9d128b7-4b9c-4d30-bcf2-7711f39642e6

📥 Commits

Reviewing files that changed from the base of the PR and between 0bf50cd and ada59a5.

📒 Files selected for processing (3)

• configure
• configure.ac
• debian/changelog

✅ Files skipped from review due to trivial changes (1)

• debian/changelog

🚧 Files skipped from review as they are similar to previous changes (2)

• configure.ac
• configure

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📝 Walkthrough

Walkthrough

The PR updates USDT (Userland Statically Defined Tracing) static probes detection in the PCP build configuration. The target_cpu condition that gates HAVE_STATIC_PROBES is changed from matching armv8l to arm, updating both the configure.ac source and generated configure script, with a changelog entry documenting the fix for armhf platform.

Changes

USDT Probes ARM Target Fix

Layer / File(s)	Summary
USDT probes ARM target condition configure.ac, configure, debian/changelog	The target_cpu check controlling static probes support is updated from armv8l to arm in the source configuration and generated script, with changelog documentation of the armhf platform fix.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

A rabbit hops 'cross ARM machines,
With probes now set to wiser scenes—
From armv8l to arm so true,
The static tracing's born anew! 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing the USDT check in configure.ac for the armhf platform by replacing the armv8l check with an arm check.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@debian/changelog`:
- Line 4: The changelog entry currently says "Fix the configure.ac USDT check
for armhf platform (closes: `#1133063`)"; update it to avoid incorrectly closing
an already-closed bug by either (a) removing "closes: `#1133063`" and leaving "Fix
the configure.ac USDT check for armhf platform", (b) changing to phrasing such
as "Further fix for `#1133063`" if this is a follow-up, or (c) verifying that the
referenced bug number is correct and replacing it with the proper (reopened or
different) bug number; ensure the final text no longer claims to close `#1133063`
unless that bug was explicitly reopened.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: d5a70f04-6856-40f0-9917-6672c8c5d193

📥 Commits

Reviewing files that changed from the base of the PR and between 1f4bcc3 and 0bf50cd.

📒 Files selected for processing (3)

• configure
• configure.ac
• debian/changelog