Automatically initialize RNG on first use.

src/bench/bench_bitcoin.cpp

@@ -6,7 +6,6 @@
 
 #include <crypto/sha256.h>
 #include <key.h>
-#include <random.h>
 #include <util/system.h>
 #include <util/strencodings.h>
 #include <validation.h>
@@ -67,7 +66,6 @@ int main(int argc, char** argv)
     const fs::path bench_datadir{SetDataDir()};
 
     SHA256AutoDetect();
-    RandomInit();
     ECC_Start();
     SetupEnvironment();