Don't emit STB_UNIQUE symbols in GCC for vortex-duckdb

[myrrc]

This fixes link errors in
https://github.com/vortex-data/duckdb-vortex/actions/runs/29920644465/job/88925008396?pr=105

[github-actions]

Polar Signals Profiling Results

Latest Run

Status	Commit	Job	Attempt	Link
🟢 Done	73d7de8		1	Explore Profiling Data

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[github-actions]

Benchmarks: Vortex queries 📖

Verdict: No clear signal (low confidence)
Attributed Vortex impact: +3.9%
Engines: DataFusion No clear signal (+6.2%, medium confidence) · DuckDB No clear signal (+1.7%, low confidence)
Vortex (geomean): 0.962x ➖
Parquet (geomean): 0.944x ➖
Shifts: Parquet (control) -5.6% · Median polish -2.7%

How to read Verdict and Engines

• Verdict: Overall PR-level signal after subtracting baseline drift estimated from Parquet control rows. It can be Likely improvement, Likely regression, or No clear signal.
• Engines: Per-engine attribution. DataFusion is compared against DataFusion/Parquet controls; DuckDB is compared against DuckDB/Parquet controls. This answers whether each engine improved or regressed independently.
• Confidence: Based on directional consistency, share of rows above the noise floor, and control-run noise.

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datafusion / vortex-file-compressed (0.950x ➖, 0↑ 0↓)

name	PR 73d7de8 (ns)	base 30091f2 (ns)	ratio (PR/base)
vortex_q00/datafusion:vortex-file-compressed	8205234	8782896	0.93
vortex_q01/datafusion:vortex-file-compressed	5232249	5418053	0.97

datafusion / parquet (0.895x ✅, 1↑ 0↓)

name	PR 73d7de8 (ns)	base 30091f2 (ns)	ratio (PR/base)
vortex_q00/datafusion:parquet	19999499	21877618	0.91
vortex_q01/datafusion:parquet 🚀	4510366	5149794	0.88

duckdb / vortex-file-compressed (1.013x ➖, 0↑ 0↓)

name	PR 73d7de8 (ns)	base 30091f2 (ns)	ratio (PR/base)
vortex_q00/duckdb:vortex-file-compressed	10018914	10052416	1.00
vortex_q01/duckdb:vortex-file-compressed	6104779	5929380	1.03

duckdb / parquet (0.996x ➖, 0↑ 0↓)

name	PR 73d7de8 (ns)	base 30091f2 (ns)	ratio (PR/base)
vortex_q00/duckdb:parquet	23352260	23618785	0.99
vortex_q01/duckdb:parquet	9451894	9419889	1.00

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