/usr/share/live/build/hooks/005-remove-gnome-icon-cache.chroot is in live-build 3.0~a57-1ubuntu25.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
# Remove GNOME icon cache.
#
# This saves space some space (e.g. on Kubuntu).
rm -f /usr/share/icons/*/icon-theme.cache
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