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 = CreateSock(m_control_host);
    if (!sock) {
        throw std::runtime_error("Cannot create socket");
    }
    if (!ConnectSocketDirectly(m_control_host, *sock, nConnectTimeout, true)) {
        throw std::runtime_error(strprintf("Cannot connect to %s", m_control_host.ToString()));
    }
    SendRequestAndGetReply(*sock, "HELLO VERSION MIN=3.1 MAX=3.1");
    return sock;
}
void Session::CheckControlSock()