Remove support for the obsolete gnome-mime-data system
GNOME has used the freedesktop.org shared MIME infrastructure since the release of GNOME 3 in 2011, and possibly longer. gnome-mime-data was used by gnome-vfs, which was finally removed from Debian in 2019.
With gnome-mime-data disabled, debian/patches/652153_drop_gmd.patch has no practical effect and can be dropped.
Closes: #947900