Add missing find_dependency for epoxy
This is required by the KWin target, but was missing a find_dependency call. If any downstream project tried to link to the KWin::kwin target, it would fail because epoxy couldn't be found.
This is required by the KWin target, but was missing a find_dependency call. If any downstream project tried to link to the KWin::kwin target, it would fail because epoxy couldn't be found.