While testing 17270 I noticed that master (bdda137878904e9401a84e308ac74c93c2ef87c1) does not run on NetBSD. I assume this started after #17085 changed the fallback locale from `C` to `C.UTF-8`. There doesn't seem to be a `C.UTF-8` locale on NetBSD.

```bash
src/bitcoind
terminate called after throwing an instance of 'std::runtime_error'
  what():  locale::facet::_S_create_c_locale name not valid
Abort trap (core dumped)
```

`LC_ALL=C src/bitcoind` works, `LC_ALL=en_US.UTF-8 src/bitcoind` does not.

```bash
locale
LANG=""
LC_CTYPE="en_US.UTF-8"
LC_COLLATE="C"
LC_TIME="C"
LC_NUMERIC="C"
LC_MONETARY="C"
LC_MESSAGES="C"
LC_ALL=""
```
{
    return nStartupTime;
}
fs::path AbsPathForConfigVal(const fs::path& path, bool net_specific)
{
    if (path.is_absolute()) {
        return path;
    }
    return fsbridge::AbsPathJoin(net_specific ? gArgs.GetDataDirNet() : gArgs.GetDataDirBase(), path);
}
void ScheduleBatchPriority()
{
#ifdef SCHED_BATCH
    const static sched_param param{};
    const int rc = pthread_setschedparam(pthread_self(), SCHED_BATCH, &param);
    if (rc != 0) {
        LogPrintf("Failed to pthread_setschedparam: %s\n", strerror(rc));
    }
#endif
}
namespace util {
#ifdef WIN32
WinCmdLineArgs::WinCmdLineArgs()