wipe duckdb source in build.rs if not fully extracted before

[onursatici]

Summary

Fix Result::unwrap() on an Err value: InvalidArchive("Symlink is not inherently safe")` when building vortex-duckdb and if a partially extracted archive exists on target

[AdamGS]

nice 🥳

[codspeed-hq]

Merging this PR will degrade performance by 15.3%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

❌ 3 regressed benchmarks
✅ 1248 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	take_map[(0.1, 0.1)]	456.5 µs	517.1 µs	-11.72%
❌	Simulation	take_map[(0.1, 0.5)]	993.8 µs	1,134.5 µs	-12.4%
❌	Simulation	take_map[(0.1, 1.0)]	1.7 ms	2.2 ms	-21.43%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing os/duckdb-src (c4175e3) with develop (4823563)}

[0ax1]

Do we prefer this over atomic swap-in of extracted dirs from tmp?