Random: Try a little bit harder in the random bytes fallback path

src/core/random_func.cpp

@@ -10,6 +10,7 @@
 #include "../stdafx.h"
 #include "random_func.hpp"
 #include "bitmath_func.hpp"
+#include "hash_func.hpp"
 #include "../debug.h"
 #include <atomic>
 #include <bit>
@@ -143,7 +144,8 @@ void RandomBytesWithFallback(std::span<uint8_t> buf)
 	bool have_warned = warned_once.exchange(true);
 	DEBUG(misc, have_warned ? 1 : 0, "Cryptographically-strong random generator unavailable; using fallback");
 
-	for (uint i = 0; i < buf.size(); i++) {
-		buf[i] = static_cast<uint8_t>(InteractiveRandom());
+	for (uint i = 0; i < buf.size(); i ++) {
+		uint64_t current_time = static_cast<uint64_t>(std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::steady_clock::now().time_since_epoch()).count());
+		buf[i] = static_cast<uint8_t>(SimpleHash64(current_time ^ InteractiveRandom()));
 	}
 }