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(m_mutex);
    std::string errmsg;
    if (!m_control_sock->IsConnected(errmsg)) {
        Log("Control socket error: %s", errmsg);
        Disconnect();
    }
}
void Session::DestGenerate(const Sock& sock)
{
    
    
    
    
    const Reply& reply = SendRequestAndGetReply(sock, "DEST GENERATE SIGNATURE_TYPE=7", false);
    m_private_key = DecodeI2PBase64(reply.Get("PRIV"));
}
void Session::GenerateAndSavePrivateKey(const Sock& sock)
{
    DestGenerate(sock);
    
    if (!WriteBinaryFile(m_private_key_file,
                         std::string(m_private_key.begin(), m_private_key.end()))) {
        throw std::runtime_error(
            strprintf("Cannot save I2P private key to %s", fs::quoted(fs::PathToString(m_private_key_file))));
    }
}
Binary Session::MyDestination() const