build/linux: Silence noisy warnings about GTK_MODULES

From GTK mouth:
https://gitlab.gnome.org/GNOME/gtk/-/blob/3.24.50/gtk/gtkmodules.c?ref_type=tags#L250

build/linux/appimage/3_dist-gimp-goappimage.sh

@@ -325,6 +325,7 @@ conf_app GTK_PATH "${LIB_DIR}/${LIB_SUBDIR}gtk-3.0"
 prep_pkg "ibus-gtk3"
 bund_usr "$UNIX_PREFIX" "lib/gtk-3.0/*.*.*/immodules/*.so" --bundler
 conf_app GTK_IM_MODULE_FILE "${LIB_DIR}/${LIB_SUBDIR}gtk-3.0/*.*.*/immodules.cache"
+conf_app GTK_MODULES "" --no-expand
 
 ## Core features
 bund_usr "$GIMP_PREFIX" "lib/libbabl*"

build/linux/flatpak/org.gimp.GIMP-nightly.json

@@ -29,6 +29,7 @@
         "--filesystem=/tmp",
         "--filesystem=xdg-run/gvfs",
         "--filesystem=xdg-run/gvfsd",
+        "--unset-env=GTK_MODULES",
         "--talk-name=org.gtk.vfs.*",
         "--talk-name=org.freedesktop.FileManager1",
         "--talk-name=org.gnome.Shell.Screenshot",

build/linux/snap/snapcraft.yaml

@@ -29,6 +29,8 @@ apps:
       LIBHEIF_PLUGIN_PATH: $SNAP/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/libheif/plugins
       #PostScript plug-in support
       GS_LIB: $SNAP/usr/share/ghostscript/10.02.1/Resource/Init
+      #Acessibility support
+      GTK_MODULES: ""
     slots:
       - dbus-gimp
     plugs: