message: build Release by default
diff: @@ -29,6 +29,21 @@ set(CMAKE_CXX_STANDARD 17)
  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
  +set(CONFIGURATION_TYPES "Debug;Release;RelWithDebInfo")
  +if (WIN32)
  + if (NOT OSPRAY_DEFAULT_CMAKE_CONFIGURATION_TYPES_SET)
  + set(CMAKE_CONFIGURATION_TYPES "${CONFIGURATION_TYPES}"
  + CACHE STRING "List of generated configurations." FORCE)
  + set(OSPRAY_DEFAULT_CMAKE_CONFIGURATION_TYPES_SET ON
  + CACHE INTERNAL "Default CMake configuration types set.")
  + endif()
  +else()
  + if(NOT CMAKE_BUILD_TYPE)
  + set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the build type." FORCE)
  + endif()
  + set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS ${CONFIGURATION_TYPES})
  +endif()
  +
  ## Find dependencies ##
  set(OpenGL_GL_PREFERENCE "LEGACY")
  