Fix subbenchmark

Author: mdboom

pyperformance/data-files/benchmarks/bm_ctypes/run_benchmark.py

@@ -90,8 +90,13 @@ def benchmark(loops):
     return pyperf.perf_counter() - t0
 
 
+def add_cmdline_args(cmd, args):
+    if args.argtypes:
+        cmd.append("--argtypes")
+
+
 if __name__ == "__main__":
-    runner = pyperf.Runner()
+    runner = pyperf.Runner(add_cmdline_args=add_cmdline_args)
     runner.metadata["description"] = "ctypes function call overhead benchmark"
 
     runner.argparser.add_argument("--argtypes", action="store_true")
@@ -101,4 +106,3 @@ def benchmark(loops):
         runner.bench_time_func("ctypes_argtypes", benchmark_argtypes, inner_loops=3)
     else:
         runner.bench_time_func("ctypes", benchmark, inner_loops=3)
-