incorrect entry in gui/libgnustep-gui.def

[Stephen Brandon]

Hi,

In the process of getting gnustep to compile on mingw/Win32,
found an incorrect entry in gui/libgnustep-gui.def.

Please remove the item:

__objc_class_name_NSMenuWindow

(the changelog talks about it having been removed recently
from the rest of the project, so it was just that it was
never removed from the .def file).

Cheers,
Stephen Brandon
stephen@brandonitconsulting.co.uk