Fix autotests on FreeBSD
Summary:
01:27:20 /usr/home/jenkins/workspace/Extragear wacomtablet kf5-qt5 FreeBSDQt5.10/autotests/faketablet/faketablet.cpp:27:10: fatal error: 'linux/input.h' file not found
01:27:20 #include <linux/input.h>
01:27:20 ^~~~~~~~~~~~~~~
Reviewers: valeriymalov
Reviewed By: valeriymalov
Subscribers: valeriymalov
Differential Revision: https://phabricator.kde.org/D12705