Remove superfluous stdlib includes from catch_benchmark.hpp

src/catch2/benchmark/catch_benchmark.hpp

@@ -31,9 +31,7 @@
 #include <algorithm>
 #include <chrono>
 #include <exception>
-#include <functional>
 #include <string>
-#include <vector>
 #include <cmath>
 
 namespace Catch {