cmake OpenVR examples

overte-org/overte cmake/macros/TargetOpenVR.cmake :9 

find_package(OpenVR REQUIRED)

OSVR/SteamVR-OSVR CMakeLists.txt :29 

find_package(OpenVR REQUIRED)

ju1ce/April-Tag-VR-FullBody-Tracker AprilTagTrackers/CMakeLists.txt :63 

find_package(openvr CONFIG REQUIRED)