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);
    m_cached_datadir_path = fs::path();
    m_cached_network_datadir_path = fs::path();
    m_cached_blocks_path = fs::path();
}
std::optional<const ArgsManager::Command> ArgsManager::GetCommand() const
{
    Command ret;
    LOCK(cs_args);
    auto it = m_command.begin();
    if (it == m_command.end()) {
        
        return std::nullopt;
    }
    if (!m_accept_any_command) {
        
        ret.command = *(it++);
    }
    while (it != m_command.end()) {
        
        ret.args.push_back(*(it++));
    }
    return ret;
}
std::vector<std::string> ArgsManager::GetArgs(const std::string& strArg) const