Recent version of emacs 29 with pgtk flag has a problem with handling super
key modifier, due to gtk bug: https://gitlab.gnome.org/GNOME/gtk/-/issues/4913
This commit workarounds it.
* gnu/packages/patches/emacs-pgtk-super-key-fix.patch: New file.
* gnu/packages/emacs.scm (emacs-next-pgtk): Use it here.
* gnu/local.mk (dist_patch_DATA): Register it here.
