No unused warning for alias benchmark

Author: TheMarex

src/benchmarks/alias.cpp

@@ -50,6 +50,7 @@ int main(int, char **)
     TIMER_START(aliased_u32);
     for (auto round : util::irange(0, num_rounds))
     {
+        (void) round;
         osrm_uint32 sum{0};
         osrm_uint32 mult{1};
         for (auto idx : indices)
@@ -68,6 +69,7 @@ int main(int, char **)
     TIMER_START(plain_u32);
     for (auto round : util::irange(0, num_rounds))
     {
+        (void) round;
         std::uint32_t sum{0};
         std::uint32_t mult{1};
         for (auto idx : indices)
@@ -86,6 +88,7 @@ int main(int, char **)
     TIMER_START(aliased_double);
     for (auto round : util::irange(0, num_rounds))
     {
+        (void) round;
         osrm_double sum{0.0};
         osrm_double mult{1.0};
         for (auto idx : indices)
@@ -105,6 +108,7 @@ int main(int, char **)
     TIMER_START(plain_double);
     for (auto round : util::irange(0, num_rounds))
     {
+        (void) round;
         double sum{0.0};
         double mult{1.0};
         for (auto idx : indices)