message: Fix incorrect variable for pybind11
diff: @@ -33,7 +33,7 @@ if(NOT "${pybind11_FOUND}")
  if(NOT pybind11_POPULATED)
  FetchContent_Populate(pybind11)
  ## the subdir will still be built since targets depend on it, but it won't be installed
  - add_subdirectory(${pybind11_SOURCE_DIR} ${pybind11_BUILD_DIR} EXCLUDE_FROM_ALL)
  + add_subdirectory(${pybind11_SOURCE_DIR} ${pybind11_BINARY_DIR} EXCLUDE_FROM_ALL)
  endif()
  endif()
  