[bug #68546] bytecode-interpreter: pt-bytecode-vm.cc uses methods removed in C++20

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Follow-up Comment #4, bug #68546 (group octave):=0A=0AThe patch is the stan=
dard recommended replacement:=0Ahttps://en.cppreference.com/cpp/memory/shar=
ed_ptr/unique=0A=0Ahttps://en.cppreference.com/cpp/memory/shared_ptr/use_co=
unt=0A=0AThe replacement is exact by definition, not by some functional equ=
ivalent.=0A=0ADmitri.=0A-- =0A=0A=0A=0A    ________________________________=
_______________________=0A=0AReply to this item at:=0A=0A  <https://savanna=
h.gnu.org/bugs/?68546>=0A=0A_______________________________________________=
=0AMessage sent via Savannah=0Ahttps://savannah.gnu.org/=0A
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