Function btck_block_spent_outputs_read 

pub unsafe extern "C" fn btck_block_spent_outputs_read(
    chainstate_manager: *const btck_ChainstateManager,
    block_tree_entry: *const btck_BlockTreeEntry,
) -> *mut btck_BlockSpentOutputs

@brief Reads the block spent coins data the passed in block tree entry points to from disk and returns it.

@param[in] chainstate_manager Non-null. @param[in] block_tree_entry Non-null. @return The read out block spent outputs, or null on error.