It seems that `--log-file` option does not work with gpg on some circumstances.
Observation:
Command line on Windows 10 witn Gpg4win 3.1.10:
```
echo hi > "C:\Users\intevation\testlog.txt"
C:\Users\intevation>type testlog.txt
hi
gpg -vv --debug-all --log-file "C:\Users\intevation\testlog.txt"
^Z
rem does not work
```
also on Debian GNU/Linux 9:
```
gpg --log-file /home/ber/testlog.txt -vv --debug-all -k
# does not work
gpg --version
gpg (GnuPG) 2.2.13
```
The documentation lists `--log-file`,e.g. https://gnupg.org/documentation/manuals/gnupg/GPG-Esoteric-Options.html#GPG-Esoteric-Options
and there is no error message.
(Maybe I'm missing something here, tried it to answer https://wald.intevation.org/forum/forum.php?thread_id=2122&forum_id=21&group_id=11