Fix build when MESHTASTIC_EXCLUDE_PKI is defined

src/main.cpp

@@ -963,6 +963,7 @@ void setup()
     i2cScanner.reset();
 #endif
 
+#if !defined(MESHTASTIC_EXCLUDE_PKI)
     // warn the user about a low entropy key
     if (nodeDB->keyIsLowEntropy && !nodeDB->hasWarned) {
         LOG_WARN(LOW_ENTROPY_WARNING);
@@ -973,6 +974,7 @@ void setup()
         service->sendClientNotification(cn);
         nodeDB->hasWarned = true;
     }
+#endif
 
 // buttons are now inputBroker, so have to come after setupModules
 #if HAS_BUTTON