Also add the SVG file that was used to produce it (derived from the old raster logo).
https://bugzilla.gnome.org/show_bug.cgi?id=768081
09004b5 Update GTK+ Windows icon (now scles up to 256x256)
gdk/win32/rc/gtk.ico | Bin 25214 -> 422926 bytes
gdk/win32/rc/gtk.svg | 482 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 482 insertions(+)
Upstream: git.gnome.org