message: Fix libpng cmake not detecting neon on m1
diff: @@ -16,7 +16,7 @@ FetchContent_Declare(libpng
  INSTALL_DIR "${CMAKE_CURRENT_BINARY_DIR}/inst"
  LOG_DIR "${CMAKE_CURRENT_BINARY_DIR}/log"
  )
  -
  +set(PNG_ARM_NEON "off" CACHE STRING "" FORCE)
  set(PNG_SHARED OFF CACHE BOOL "" FORCE)
  FetchContent_MakeAvailable(libpng)
  