Feature gate bench impl

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/frame/core-fellowship/src/lib.rs

@@ -634,6 +634,7 @@ impl<T: Config<I>, I: 'static> RankedMembersSwapHandler<T::AccountId, u16> for P
 	}
 }
 
+#[cfg(feature = "runtime-benchmarks")]
 impl<T: Config<I>, I: 'static>
 	pallet_ranked_collective::BenchmarkSetup<<T as frame_system::Config>::AccountId> for Pallet<T, I>
 {

substrate/frame/salary/src/lib.rs

@@ -478,6 +478,7 @@ impl<T: Config<I>, I: 'static>
 	}
 }
 
+#[cfg(feature = "runtime-benchmarks")]
 impl<T: Config<I>, I: 'static>
 	pallet_ranked_collective::BenchmarkSetup<<T as frame_system::Config>::AccountId> for Pallet<T, I>
 {