Fix build of xorg-server when libudev-devd is installed

[rezny]

Summary

The configure script for xorg-server detects libudev-devd as udev and the build fails while compiling code depending on logind. The ports that depend on libudev-devd, xyaland and xf86-input-libinput, were added after the last update and the issue is not seen in poudriere but appears on live systems. Fix it by explicitly disabling use of udev, and thus also logind/systemd, instead of relying on the assumption configure would never find udev.

Test Plan

confirmed on 11 and HEAD amd64

[swills]

Approved