message: Cache CXX11_ABI setting when downloading OSPRay
diff: @@ -40,8 +40,8 @@ else()
  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  ## The pre-built library was compiled pre-c++-11, so disable the CXX11 ABI
  - set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_GLIBCXX_USE_CXX11_ABI=0")
  - message (STATUS "setting -D_GLIBCXX_USE_CXX11_ABI=0")
  + set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_GLIBCXX_USE_CXX11_ABI=0" CACHE STRING "Disable CXX11 ABI" FORCE)
  + message (STATUS "Setting -D_GLIBCXX_USE_CXX11_ABI=0")
  endif()
  ## The pre-build library was compiled with TBB 2021.2.0, so ensure the same TBB is found
  