BUG #14640: text mode installation still send X11 requests

The following bug has been logged on the website:

Bug reference: 14640
Logged by: Eric Hoffman
Email address: ehoffman(at)videotron(dot)ca
PostgreSQL version: 9.6.2
Operating system: Linux
Description:

I'm installing PostgreSQL (on Linux) from a SSH terminal (SSH client
terminal under Windows). So, I install the package using the "--mode text"
option.

My terminal does have X11 forwarding enabled, but I have not started a X11
server application on my Windows PC (which I start only when doing
development).

There should be no issue, as I'm not expecting X11 requests, especially
since I used the "--mode text" install. However, my terminal still give me
errors telling that X11 requests have been made while I don't have X11
server started.

X11 requests are also made even with installation options "--mode unattended
--unattendedmodeui none"

The installer run fine though, and with an SSH session disabling the X11
forwarding, it also install fine. So my guess is that the installer is
still trying to detect if X11 is available.

Regards,
Eric Hoffman