jxl_from_tree read and write to stdin and stdout (#1434)
jxl_from_tree read and write to stdin and stdout (#1434)

* jxl_from_tree read and write to stdin and stdout

* use - for stdin/stdout
libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl