x11/gnome-shell: update to 47.8

Update gnome-shell to version 47.8.

Remove duplicate pkg-message.

Fix warning in gdm log, follow function defined in js/misc/loginManager.js

'GetSessionForCookie' is still valid with ConsoleKit2, and it has same
signature as its equivalent at systemd. But in js/misc/loginManager.js
we use 'GetCurrentSession' function.

We don't appear to need libdrm.so, libgnome-autoar-0.so, or libicuuc.so.
(truckman).

gettext -> gettext-tools (truckman).

We don't need USE_LDCONFIG (truckman).

Pet portlint. truckman).

PR: 287933
MFH: 2025Q3
(cherry picked from commit 675f110bea52702adaa5974997f6da1c7969c641)