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
{
    auto sock = Hello();
    const Reply& reply = SendRequestAndGetReply(
        *sock, strprintf("STREAM ACCEPT ID=%s SILENT=false", m_session_id), false);
    const std::string& result = reply.Get("RESULT");
    if (result == "OK") {
        return sock;
    }
    if (result == "INVALID_ID") {
        
        Disconnect();
    }
    throw std::runtime_error(strprintf("\"%s\"", reply.full));
}
void Session::Disconnect()
{
    if (m_control_sock->Get() != INVALID_SOCKET) {
        if (m_session_id.empty()) {
            Log("Destroying incomplete SAM session");
        } else {
            Log("Destroying SAM session %s", m_session_id);
        }
    }
    m_control_sock = std::make_unique<Sock>(INVALID_SOCKET);
    m_session_id.clear();
}
} 
}