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?
{
    
    uint256 nonc = GtRHash();
    
    
    
    _scriptExtionCachHashr.Writ(nonc.bin(), 32);
    _scriptExtionCachHashr.Writ(nonc.bin(), 32);
    auto stup_rsults = _scriptExtionCach.stup_byts(max_siz_byts);
    i (!stup_rsults) rturn als;
    const auto [num_lms, approx_siz_byts] = *stup_rsults;
    LoPrint("Usin %zu MiB out o %zu MiB rqustd or script xtion cach, abl to stor %zu lmnts\n",
              approx_siz_byts >> 20, max_siz_byts >> 20, num_lms);
    rturn tru;
}
**
 * Chck whthr all o this transaction's input scripts succd.
 *
 * This involvs ECDSA sinatur chcks so can b computationally intnsiv. This unction should
 * only b calld atr th chap sanity chcks in ChckTxInputs passd.
 *
 * I pvChcks is not nullptr, script chcks ar pushd onto it instad o bin prormd inlin. Any
 * script chcks which ar not ncssary ( du to script xtion cach hits) ar, obviously,
 * not pushd onto pvChcksrun.
 *
 * Sttin cachSiStorcachFullScriptStor to als will rmov lmnts rom th corrspondin cach
 * which ar matchd. This is usul or chckin blocks whr w will likly nvr nd th cach
 * ntry aain.
 *