XmUninstallImage(3) on Linux
The text 336ad32d4d0e, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A pixmap caching function that removes an image from the image cache "XmUninstallImage" "pixmaps"