packaging/aix: link SQLite with -lm for SQLITE_ENABLE_MATH_FUNCTIONS

[pgimalac]

What does this PR do?

Adds -lm to the SQLite amalgamation build command in stage 01.

Motivation

SQLite is compiled with -DSQLITE_ENABLE_MATH_FUNCTIONS which activates math functions (sin, cos, log, etc.) that require libm. Without -lm, the linker fails with undefined symbol errors when building from scratch (without a warm lib cache).

Describe how you validated your changes

Validated locally with a full from-scratch build (empty lib cache).

Additional Notes

N/A

[github-actions]

@codex review

[datadog-prod-us1-3]

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 2 Pipeline jobs failed

DataDog/datadog-agent | files_inventory_check     

🔧 Fix in code (Fix with Cursor).

Key 'datadog-agent/static_quality_gates/GATE_REPORTS/61691af9d6c1a02449e9bd2333005ec9d9455949/agent_deb_amd64_size_report_61691af9.yml' does not exist.

DataDog/datadog-agent | unit_tests_notify     

🛟 This job is unlikely to succeed on retry. Please review your pipeline configuration.

Command 'ls junit-tests_*.tgz' failed with exit code 2: No such file or directory.

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