Fix meson installation of xid_wraparound test.
Fix for
e255b646a, to prevent installation of xid_wraparound test
module during main install.
Reported-by: Peter Eisentraut
Discussion: https://postgr.es/m/
84cd416a-0e37-4019-8380-
1c8a3cdd8c5c%40eisentraut.org