/usr/share/guile-gnome-2/gnome/overrides/gdk.defs-type-ignores is in guile-gnome2-dev 2.16.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ;; -*- scheme -*-
(ignore-types "GdkColor" "GdkRectangle" "GdkPixmapObject" "GdkWindowObject" "GdkDrawable")
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