windows: build Windows binaries for 1.9.3 and 2.0.0 at a time
windows: build Windows binaries for 1.9.3 and 2.0.0 at a time

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