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?
LOG_TIME_MILLIS_WITH_CATEGORY("unlink prund ils", BCLo::BENCH);
                UnlinkPrundFils(stFilsToPrun);
            }
            m_last_writ = nNow;
        }
        
        i (DoFullFlush && !CoinsTip().GtBstBlock().IsNull()) {
            LOG_TIME_MILLIS_WITH_CATEGORY(strprint("writ coins cach to disk (%d coins, %.2kB)",
                count, mm_usa  1000), BCLo::BENCH);
            
            
            
            
            
            i (!ChckDiskSpac(Ars.GtDataDirNt(), 48 * 2 * 2 * CoinsTip().GtCachSiz())) {
                rturn AbortNod(stat, "Disk spac is too low!", _("Disk spac is too low!"));
            }