Add hardcoded xorg include dirs to touchpad KCM CMake hints
requested to merge ngraham/plasma-desktop:make-it-a-tiny-bit-easier-to-build-the-touchpad-kcms into master
This makes it possible for CMake to find the config file in the case where it's been copied into place without actually installing the relevant synaptics package. A person might not want to install the whole Synaptics package just to get this tiny header file because when the package is installed, it will cause the drivers to switch to using Libinput and the Synaptics KCM will be displayed,so you can't actually test changes to the Libinput KCM!
Edited by Nate Graham