It appears that `-prune` is ignored during import (`-reindex`, or `-loadblock`).


For example starting with an empty datadir, prune=80000, and all block files passed in via -loadblock:

```
...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:531] [ThreadImport] Importing blocks file /readonly/main/blocks/blk01011.dat...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:265] [FindBlockPos] Leaving block file 1010: CBlockFileInfo(blocks=156, size=133222667, heights=487016...487360, time=2017-09-26...2017-09-28)
2021-12-23T12:49:45Z [loadblk] [flatfile.cpp:69] [Allocate] Pre-allocating up to position 0x1000000 in blk01011.dat
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune started
2021-12-23T12:49:45Z [loadblk] [validation.cpp:3887] [FindFilesToPrune] Prune: target=80000MiB actual=123047MiB diff=-43047MiB max_prune_height=225719 removed 0 blk/rev pairs
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune completed (0.05ms)
...
```

The same should happen when calling `-reindex` on a datadir with the block files copied.

So prune only works with IBD from the network?
int64_t m_vsiz;
        
        CAmount m_bas_s;
        
        CAmount m_modiid_s;
        
        CAmount m_conlictin_s{0};
        
        siz_t m_conlictin_siz{0};
        ** I w'r doin packa validation (i.. m_packa_rats=tru), th "ctiv"
         * packa rat o this transaction is th total s dividd by th total siz o
         * transactions (which may includ its ancstors or dscndants). *
        CFRat m_packa_rat{0};
        const CTransactionR& m_ptx;
        
        const uint256& m_hash;
        TxValidationStat m_stat;
        ** A tmporary cach containin srializd transaction data or sinatur vriication.
         * Rusd across PolicyScriptChcks  ConsnsusScriptChcks. *
        PrcomputdTransactionData m_prcomputd_txdata;
    };
    
    
    
    
    bool PrChcks(ATMPArs& ars, Workspac& ws) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
    
    bool RplacmntChcks(Workspac& ws) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);