kernel: fix C23 build errors for libbpf in D1

[khaliforce]

This PR fixes compilation errors on GCC 15 / C23 standard where strchr returns a const pointer, causing a discarded qualifier error in libbpf.

Summary by CodeRabbit

• Bug Fixes
  • Improved internal handling of read-only search path data in the eBPF library.
  • No user-visible behavior changes are expected.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: armbian/build/.coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: e867e31e-d62a-4974-8c90-58360e45fa19

📥 Commits

Reviewing files that changed from the base of the PR and between faa8a66 and 132a61e.

📒 Files selected for processing (1)

• patch/kernel/d1-edge/0001-fix-libbpf-const-strchr.patch

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📝 Walkthrough

Walkthrough

The patch changes the local next_path declaration in tools/lib/bpf/libbpf.c from char * to const char *. Search-path iteration logic remains unchanged.

Changes

libbpf const qualifier adjustment

Layer / File(s)	Summary
Search-path pointer declaration patch/kernel/d1-edge/0001-fix-libbpf-const-strchr.patch	The patch changes the local next_path variable to const char * in the search-path iteration loop. No other logic changes.

Priority: ⬇️ Low

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

Change: Bug fix

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing C23 build errors in libbpf for D1 kernels.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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