Store destination_private in std::unique_ptr
This simplifies the code a bit.
It also fixes a 'code smell' found by https://sonarcloud.io/project/overview?id=tsdgeos_poppler_mirror
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This simplifies the code a bit.
It also fixes a 'code smell' found by https://sonarcloud.io/project/overview?id=tsdgeos_poppler_mirror