fix gcc warning: deleting object of polymorphic class type 'i2p::stream::StreamingDestination' which has non-virtual destructor might cause undefined behaviour [-Wdelete-non-virtual-dtor]
fix gcc warning: deleting object of polymorphic class type 'i2p::stream::StreamingDestination' which has non-virtual destructor might cause undefined behaviour [-Wdelete-non-virtual-dtor]

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