fixed some compilation issues on older compilers; disabled building of blockchain_utilities that prevent Mac from building statically

src/multisig/multisig_tx_builder_ringct.cpp

@@ -480,6 +480,7 @@ static void set_tx_inputs(
       offsets.emplace_back(e.first);
     unsigned_tx.vin[i] = cryptonote::txin_to_key{
       .amount = 0,
+      .asset_type = sources[i].asset_type,
       .key_offsets = cryptonote::absolute_output_offsets_to_relative(offsets),
       .k_image = rct::rct2ki(sources[i].multisig_kLRki.ki),
     };