Revert "xdg-utils: update to latest git and ship xdg-terminal"

This reverts commit 59c8ed59bfd019047d91b0432c7034b4c4ba03b1.
xdg-utils: reinstall xdg-terminal

It's being used by e.g. gnome-session when Terminal=true is set in
.desktop files, like xinput-calibrator does.

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>