build/windows: Warn about the fate of 32-bit

It's desirable to announce this with advance to not surprise anyone.

build/windows/1_build-deps-msys2.sh

@@ -15,6 +15,10 @@ if [ -z "$GITLAB_CI" ]; then
   cd $(dirname $PWD)
 fi
 
+if [ "$MSYSTEM_CARCH" = "i686" ]; then
+  echo -e "\033[33m(WARNING)\033[0m: 32-bit builds will be dropped in a future release. See: https://gitlab.gnome.org/GNOME/gimp/-/issues/10922"
+fi
+
 
 # Install the required (pre-built) packages for babl, GEGL and GIMP
 if [ "$MSYSTEM_CARCH" != "aarch64" ]; then

build/windows/2_build-gimp-msys2.sh

@@ -13,6 +13,10 @@ if [ -z "$GITLAB_CI" ]; then
   git submodule update --init --force
 fi
 
+if [ "$MSYSTEM_CARCH" = "i686" ]; then
+  echo -e "\033[33m(WARNING)\033[0m: 32-bit builds will be dropped in a future release. See: https://gitlab.gnome.org/GNOME/gimp/-/issues/10922"
+fi
+
 
 if [ "$GITLAB_CI" ]; then
   # Install the required (pre-built) packages for GIMP again

build/windows/2_bundle-gimp-uni_base.sh

@@ -9,6 +9,10 @@ if [ "$1" != '--authorized' ] && [ "$1" != '--force' ]; then
   exit 1
 fi
 
+if [ "$1" = '--force' ] && [ "$MSYSTEM_CARCH" = "i686" ]; then
+  echo -e "\033[33m(WARNING)\033[0m: 32-bit builds will be dropped in a future release. See: https://gitlab.gnome.org/GNOME/gimp/-/issues/10922"
+fi
+
 
 # NOTE: The bundling scripts, different from building scripts, need to set
 # the ARTIFACTS_SUFFIX, even locally: 1) to avoid confusion (bundle dirs are