prerm is in dietlibc-dev 0.33~cvs20120325-4.
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
test "$1" = 'remove' || exit 0
test ! -h /usr/lib/diet/lib-x86_64 || rm -f /usr/lib/diet/lib-x86_64
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