Revert "gtk2: set_cursor is a property."
Revert "gtk2: set_cursor is a property."

This reverts commit bc7244240b1ddc7e10218642be5465f78414d14d.

kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2