A Gitlab security update will be applied on March 29th, between 8am and 10am, EST (UTC-05:00). This site may have intermittent delays during that time.
Extend the change made by commit fe4b25ec (Teach target_* commands to set INTERFACE properties of IMPORTED targets, 2017-09-18, v3.11.0-rc1~433^2~2) to work with imported targets of type `UNKNOWN`. Fixes: #19434