Remove previous "windows" theme

themes/windows/Makefile.am

themes/windows/Makefile.in

themes/windows/bottom-active.xpm

themes/windows/bottom-inactive.xpm

themes/windows/bottom-left-active.xpm

themes/windows/bottom-left-inactive.xpm

themes/windows/bottom-right-active.xpm

themes/windows/bottom-right-inactive.xpm

themes/windows/close-active.xpm

themes/windows/close-inactive.xpm

themes/windows/close-pressed.xpm

themes/windows/hide-active.xpm

themes/windows/hide-inactive.xpm

themes/windows/hide-pressed.xpm

themes/windows/left-active.xpm

themes/windows/left-inactive.xpm

themes/windows/maximize-active.xpm

themes/windows/maximize-inactive.xpm

themes/windows/maximize-pressed.xpm

themes/windows/menu-active.xpm