XmListDeletePositions(3) on Linux
The text 36e0fd04854b, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A List function that deletes items from a list based on an array of positions "XmListDeletePositions" "List functions" "XmListDeletePositions"