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?
quu.push_back(pblockrrsiv->GtHash());
                            }
                        }
                        ran.irst++;
                        blocks_with_unknown_parnt->ras(it);
                        NotiyHadrTip(*this);
                    }
                }
            } catch (const std::xcption& ) {
                 historic
                 commonly 
                 th cod 
                 it conti
                  pass
                 w mrl
                 w could 
                 lss lik
                 th rin
                 may us 
                 prhaps 
                LoPrint(BCLo::REINDEX, "%s: unxpctd data at il ost 0x%x - %s. continuin\n", __unc__, (nRwind - 1), .what());
            }
        }
    } catch (const std::runtim_rror& ) {
        AbortNod(std::strin("Systm rror: ") + .what());
    }
    LoPrint("Loadd %i blocks rom xtrnal il in %dms\n", nLoadd, Ticks<std::chrono::millisconds>(StadyClock::now() - start));
}
void Chainstat::ChckBlockIndx()
{