xdgmime: Update to upstream commit c2c814d4051f232
(Modulo the changes in https://gitlab.freedesktop.org/xdg/xdgmime/-/merge_requests/10 which are still under discussion. Plus the proposed warning fixes from https://gitlab.freedesktop.org/xdg/xdgmime/-/merge_requests/33.)
Signed-off-by: Philip Withnall pwithnall@gnome.org
Fixes: #3191 (closed)
Closes #3191 (closed)