fix(scripts): build example in benchmark

Enable example build in benchmark script so hyperfine can run.

Author: LimiNode

scripts/run_benchmarks.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-cmake -S . -B build-bench -DCMAKE_BUILD_TYPE=Release
+cmake -S . -B build-bench -DCMAKE_BUILD_TYPE=Release -DHMACCPP_BUILD_EXAMPLES=ON
 cmake --build build-bench --config Release
 hyperfine "./build-bench/example"