[glib2][win32] fix wrong parent class for GLib::IOChannelWin32Socket.
[glib2][win32] fix wrong parent class for GLib::IOChannelWin32Socket.

[ruby-list:48587] Re: [ANN] Ruby-GNOME2 1.1.0

Reported by ashbb. Thanks!!!

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