bench: Remove requirement that all benches use RegTestingSetup

src/bench/mempool_eviction.cpp

@@ -4,6 +4,7 @@
 
 #include <bench/bench.h>
 #include <policy/policy.h>
+#include <test/util/setup_common.h>
 #include <txmempool.h>
 
 
@@ -24,6 +25,8 @@ static void AddTx(const CTransactionRef& tx, const CAmount& nFee, CTxMemPool& po
 // unique transactions for a more meaningful performance measurement.
 static void MempoolEviction(benchmark::State& state)
 {
+    RegTestingSetup test_setup;
+
     CMutableTransaction tx1 = CMutableTransaction();
     tx1.vin.resize(1);
     tx1.vin[0].scriptSig = CScript() << OP_1;