lose some build warnings

test/benchmark_setup_teardown_test.cc

diff --git a/test/benchmark_setup_teardown_test.cc b/test/benchmark_setup_teardown_test.cc
index f18c570..efa34e1 100644
--- a/test/benchmark_setup_teardown_test.cc
+++ b/test/benchmark_setup_teardown_test.cc
@@ -80,7 +80,7 @@
 
 class FIXTURE_BECHMARK_NAME : public ::benchmark::Fixture {
  public:
-  void SetUp(const ::benchmark::State& state) BENCHMARK_OVERRIDE {
+  void SetUp(const ::benchmark::State&) BENCHMARK_OVERRIDE {
     fixture_interaction::fixture_setup++;
   }
 
@@ -92,7 +92,7 @@
   }
 }
 
-static void DoSetupWithFixture(const benchmark::State& state) {
+static void DoSetupWithFixture(const benchmark::State&) {
   fixture_interaction::setup++;
 }
 
@@ -110,7 +110,7 @@
 int setup = 0;
 }
 
-static void DoSetupWithRepetitions(const benchmark::State& state) {
+static void DoSetupWithRepetitions(const benchmark::State&) {
   repetitions::setup++;
 }
 static void BM_WithRep(benchmark::State& state) {