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
{
    try {
        while (!*m_interrupt) {
            Sock::Event occurred;
            if (!conn.sock->Wait(MAX_WAIT_FOR_IO, Sock::RECV, &occurred)) {
                throw std::runtime_error("wait on socket failed");
            }
            if (occurred == 0) {
                
                continue;
            }
            const std::string& peer_dest =
                conn.sock->RecvUntilTerminator('\n', MAX_WAIT_FOR_IO, *m_interrupt, MAX_MSG_SIZE);
            conn.peer = CService(DestB64ToAddr(peer_dest), I2P_SAM31_PORT);
            return true;
        }
    } catch (const std::runtime_error& e) {
        Log("Error accepting: %s", e.what());
        CheckControlSock();
    }
    return false;
}
bool Session::Connect(const CService& to, Connection& conn, bool& proxy_error)