Allow pipes as concat in the upgrader (#6737)
Allow pipes as concat in the upgrader (#6737)

This is needed for fix #6683

Signed-off-by: Oscar Rydhé <2b3e17a7d6f527397936131db0874b14455019f5@gmail.com>
StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery