blockchain: fix sync at v14 boundary

Miners with MLSAG txes which they'd already verified included
a couple in that block, but the consensus rules had changed
in the meantime, so that block is technically invalid and any
node which did not already have those two txes in their txpool
could not sync. Grandfather them in, since it has no effect in
practice.

src/cryptonote_core/blockchain.cpp

@@ -3068,9 +3068,21 @@ bool Blockchain::check_tx_outputs(const transaction& tx, tx_verification_context
     if (tx.version >= 2) {
       if (tx.rct_signatures.type <= rct::RCTTypeBulletproof2)
       {
-        MERROR_VER("Ringct type " << (unsigned)tx.rct_signatures.type << " is not allowed from v" << (HF_VERSION_CLSAG + 1));
-        tvc.m_invalid_output = true;
-        return false;
+        // two MLSAG txes went in due to a bug with txes that went into the txpool before the fork, grandfather them in
+        static const char * grandfathered[2] = { "c5151944f0583097ba0c88cd0f43e7fabb3881278aa2f73b3b0a007c5d34e910", "6f2f117cde6fbcf8d4a6ef8974fcac744726574ac38cf25d3322c996b21edd4c" };
+        crypto::hash h0, h1;
+        epee::string_tools::hex_to_pod(grandfathered[0], h0);
+        epee::string_tools::hex_to_pod(grandfathered[1], h1);
+        if (cryptonote::get_transaction_hash(tx) == h0 || cryptonote::get_transaction_hash(tx) == h1)
+        {
+          MDEBUG("Grandfathering cryptonote::get_transaction_hash(tx) in");
+        }
+        else
+        {
+          MERROR_VER("Ringct type " << (unsigned)tx.rct_signatures.type << " is not allowed from v" << (HF_VERSION_CLSAG + 1));
+          tvc.m_invalid_output = true;
+          return false;
+        }
       }
     }
   }