util: Allow use of C++14 chrono literals

src/randomenv.cpp

@@ -69,7 +69,7 @@ void RandAddSeedPerfmon(CSHA512& hasher)
 
     // This can take up to 2 seconds, so only do it every 10 minutes.
     // Initialize last_perfmon to 0 seconds, we don't skip the first call.
-    static std::atomic<std::chrono::seconds> last_perfmon{std::chrono::seconds{0}};
+    static std::atomic<std::chrono::seconds> last_perfmon{0s};
     auto last_time = last_perfmon.load();
     auto current_time = GetTime<std::chrono::seconds>();
     if (current_time < last_time + std::chrono::minutes{10}) return;