* guix/build/glib-or-gtk-build-system.scm (wrap-all-programs): Add #:glib-or-gtk-wrap-excluded-outputs parameter and honor it. * guix/build-system/glib-or-gtk.scm (glib-or-gtk-build): Add #:glib-or-gtk-wrap-excluded-outputs parameter and pass it in BUILDER. * doc/guix.texi (Build Systems): Mention it.