This commit remove a check for the log level in the `printVersion()`
function that was making `nix --version` behaving weirdly and
inconsistently compared to other `nix-*` commands.
The root cause is the following code in `lix/nix/main.cc` that change
the log level at runtime if nix is call interactively:
```cpp
if (isatty(STDERR_FILENO)) {
verbosity = lvlNotice;
} else {
verbosity = lvlInfo;
}
```
This should be removed, but since it has more implication it's gonna be
done in another CL.
Fix: https://git.lix.systems/lix-project/lix/issues/620
Change-Id: Id2c83c51d7ef799ee2f9b8dbdd2bfaeaf2df6188
Justin !
0d14c2b67a