message: CMake: fix wasm build on windows machines
  Noticed this while trying to help with
diff: @@ -137,7 +137,7 @@ function(add_envmap SOURCE TARGET)
  # Create a low-resolution skybox.
  COMMAND cmgen -x ${TARGET} ${CMGEN_ARGS_TINY} ${source_envmap}
  - COMMAND mv ${target_skybox} ${target_skybox_tiny}
  + COMMAND ${CMAKE_COMMAND} -E rename ${target_skybox} ${target_skybox_tiny}
  # Create KTX files for the full-size envmap.
  COMMAND cmgen -x ${TARGET} ${CMGEN_ARGS} ${source_envmap}
  