The `make install` script, which most users would run via `sudo` to install into `/usr/local`, will use the current umask of the root user when creating certain files and directories. If one uses a restrictive umask by default (e.g. `umask 077`), this means that only the root user will be able to use the full Bitcoin package.

**Expected behavior**

The install script creates all directories and files, including man pages, etc., with permissions `644` / `755`.

**Actual behavior**

Certain folders are created using the default umask, e.g.:

- /usr/local/share/man/man1/
- /usr/local/lib/pkgconfig/
- [...]

This means that only root can access files in these folders and other users won't be able to read the man pages (for example).

**To reproduce**

```bash
$ ./autogen.sh
$ make
$ sudo -iu root
% umask 077
% make install
```

**System information**

OS: Linux
bitcoind version: HEAD
{
    LOCK(cs_args);
    fs::path& path = net_specific ? m_cached_network_datadir_path : m_cached_datadir_path;
    
    
    if (!path.empty()) return path;
    const fs::path datadir{GetPathArg("-datadir")};
    if (!datadir.empty()) {
        path = fs::absolute(datadir);
        if (!fs::is_directory(path)) {
            path = "";
            return path;
        }
    } else {
        path = GetDefaultDataDir();
    }
    if (!fs::exists(path)) {
        fs::create_directories(path / "wallets");
    }
    if (net_specific && !BaseParams().DataDir().empty()) {
        path /= fs::PathFromString(BaseParams().DataDir());
        if (!fs::exists(path)) {
            fs::create_directories(path / "wallets");
        }
    }
    return path;
}
void ArgsManager::ClearPathCache()