License benchmarks file to comply with REUSE.

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+<!--
+SPDX-FileCopyrightText: 2025 Chris Duncan <chris@zoso.dev>
+SPDX-License-Identifier: GPL-3.0-or-later
+-->
+
 # Benchmarks to compute 16,777,216 nonces
 _Each test is 128 samples of one pass (dispatch or frame) at zero threshold with no early exit_