Fix build on older RHEL and CentOS release

[kurik]

Older RHEL and CentOS releases do not support Recommends directive.

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Updated RPM packaging to conditionally recommend pcp-atop only on supported platforms and RHEL versions.
  • Corrected the packaged PCP release version to 7.2.1-1.
• Chores
  • Updated RPM changelog information for the 7.2.1 release.

Walkthrough

The RPM specifications now recommend pcp-atop only outside RHEL or on RHEL versions newer than 7. The Red Hat specification version changes to 7.2.1-1, with an updated changelog entry.

Changes

RPM packaging

Layer / File(s)	Summary
Conditional recommendation and release metadata build/rpm/pcp.spec.in, build/rpm/redhat.spec	The specifications conditionally recommend pcp-atop. redhat.spec updates the package version to 7.2.1-1 and replaces the previous changelog entry.

Possibly related PRs

• performancecopilot/pcp#2685: Modifies the same pcp-atop RPM recommendation with different packaging conditions.

Suggested reviewers: natoscott, kmcdonell

Poem

A rabbit checks the RPM nest,
And keeps the atop rule expressed.
For RHEL seven, paths stay clear,
Newer builds may recommend it here.
Seven-two-one hops into view.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Description check	✅ Passed	The description accurately identifies the unsupported Recommends directive on older RHEL and CentOS releases.
Title check	✅ Passed	The title clearly summarizes the main change: fixing builds on older RHEL and CentOS releases.

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[coderabbitai]

Actionable comments posted: 2

🤖 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 `@build/rpm/redhat.spec`:
- Around line 3552-3553: Update the changelog entry for version 7.2.1-1 in the
RPM spec to use the actual package release date, replacing the future-dated
August 14, 2026 value while preserving the existing release notes.
- Around line 3552-3553: Update the RPM changelog in build/rpm/redhat.spec by
preserving the existing 7.2.0-2 release entry and appending the new 7.2.1-1
entry above it, maintaining the prior release history and changelog ordering.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

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

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Repository UI (inherited), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: 3153d389-b1c2-46a1-8725-3a262ce259b1

📥 Commits

Reviewing files that changed from the base of the PR and between 5b519c5 and 3c03932.

📒 Files selected for processing (2)

• build/rpm/pcp.spec.in
• build/rpm/redhat.spec