Fix CURRENT_ROOT_INSTALL_DIR on Windows for find_package(ospray)
Fix CURRENT_ROOT_INSTALL_DIR on Windows for find_package(ospray)

MengjiaoH/ospray,MengjiaoH/ospray,wilsonCernWq/ospray,ospray/OSPRay,wilsonCernWq/ospray,MengjiaoH/ospray,MengjiaoH/ospray,ospray/OSPRay,ospray/OSPRay,MengjiaoH/ospray,ospray/OSPRay,wilsonCernWq/ospray