Frees memory allocated for config entry lists.
Once you are done with the string arrays filled in by list_config_entries and
list_config_sections, you can free them again with this function. The passed
array pointer will be set to NULL, and you directly can pass the same pointer
again to list_config_entries or list_config_sections later - but you also
could pass them again without freeing first, since the memory is re-allocated
when the pointer is not NULL.
See list_config_entries for an example of how to use it.
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