message: Use mayor version only default path of Win installer
  Changes in minor/patch version will upgrade OSPRay, thus the version in
  the path won't match the installed version after update anymore.
diff: @@ -125,7 +125,7 @@ IF (WIN32) # Windows specific settings
  SET(CPACK_WIX_PROPERTY_ARPURLINFOABOUT http://www.ospray.org/)
  SET(CPACK_PACKAGE_NAME "OSPRay v${OSPRAY_VERSION}")
  SET(CPACK_COMPONENTS_ALL lib devel apps mpi redist)
  - SET(CPACK_PACKAGE_INSTALL_DIRECTORY "Intel\\\\OSPRay v${OSPRAY_VERSION}")
  + SET(CPACK_PACKAGE_INSTALL_DIRECTORY "Intel\\\\OSPRay v${OSPRAY_VERSION_MAJOR}")
  MATH(EXPR OSPRAY_VERSION_NUMBER "10000*${OSPRAY_VERSION_MAJOR} + 100*${OSPRAY_VERSION_MINOR} + ${OSPRAY_VERSION_PATCH}")
  SET(CPACK_WIX_PRODUCT_GUID "9D64D525-2603-4E8C-9108-845A146${OSPRAY_VERSION_NUMBER}")
  SET(CPACK_WIX_UPGRADE_GUID "9D64D525-2603-4E8C-9108-845A146${OSPRAY_VERSION_MAJOR}0000") # upgrade as long as major version is the same
  