message: Be more consistent about relative paths
diff: #include <GL/glew.h>
  #endif
  -#include <visionaray/cuda/graphics_resource.h>
  -#include <visionaray/gl/compositing.h>
  -#include <visionaray/gl/handle.h>
  -#include <visionaray/gl/util.h>
  -
  +#include "cuda/graphics_resource.h"
  +#include "gl/compositing.h"
  +#include "gl/handle.h"
  +#include "gl/util.h"
  #include "math/forward.h"
  #include "math/vector.h"
  #include "detail/macros.h"
  