[Development] object_script files remain after make distclean

[cat fa]

Hi everyone,
        object_script files are generated due to the reason discussed
in http://www.qtcentre.org/archive/index.php/t-6002.html . When
excuting make distclean, all Makefiles are removed except
object_script files. I think qmake generates object_scrip files, but
forgets adding script to remove it. Is the a bug or should I modify
.pro file to add relevant statement?