evm executable leaves database files behind

[holiman]

After running the fuzzer for some time, my system hit out-of-disk errors.
It had filled the disk with /tmp/erigon-memdb-<numbers>/, where each folder contains one mdbx.dat at 24KiB, and an mdbx.lck at 1MiB. It seems that each invocation of evm creates one

Example to create one:

/home/martin/workspace/erigon-evm --json --noreturndata --nomemory statetest /tmp/00048943-mixed-1.json

I retried with 60024361821f6bcc6b8e724aed1b07531c447fce, same issue.

[AskAlexSharov]

fixed by #7517