message: include SkeletonReportTypes
diff: #include <osvr/Util/Vec3C.h>
  #include <osvr/Util/ChannelCountC.h>
  #include <osvr/Util/BoolC.h>
  +#include <osvr/Util/SkeletonReportTypesC.h>
  /* Library/third-party includes */
  /* none */
  