This fixes this kind of warning by enforcing the default copy
constructor, since the behavior is the same:
../src/./primitives/transaction.h:354:5: warning: definition of implicit
copy assignment operator for 'PrecomputedTransactionData' is deprecated
because it has a user-declared copy constructor [-Wdeprecated-copy]
PrecomputedTransactionData(const PrecomputedTransactionData &txdata)
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/10.1.0/../../../../include/c++/10.1.0/bits/move.h:198:11:
note: in implicit copy assignment operator for
'PrecomputedTransactionData' first required here
__a = _GLIBCXX_MOVE(__b);
^
../src/./validation.h:616:14: note: in instantiation of function
template specialization 'std::swap<PrecomputedTransactionData>'
requested here
std::swap(txdata, check.txdata);