prerm is in cpl-plugin-sinfo-calib 2.4.0+dfsg-3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
set -e
rm -rfd /usr/share/cpl-plugins/sinfo-2.4.0/cal/
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