Directly link with Visionaray in examples
Directly link with Visionaray in examples

Don't require Visionaray to be visible to find_package(), for that requires the library to be present before the examples can be built

tu500/visionaray,ukoeln-vis/ctpperf,szellmann/visionaray,szellmann/visionaray,ukoeln-vis/ctpperf,tu500/visionaray