Add KF5::WaylandServer to include the required directories
Summary: abstract_egl_backend.cpp includes several kwayland headers, but the include paths aren't added for kwayland. This patch solves the problem, by adding kwayland as requirement for the opengl scene plugin.
Reviewers: KWin, graesslin
Reviewed By: KWin, graesslin
Subscribers: kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D10373