prerm is in xzgv 0.9.1-3.
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 6 | #!/bin/sh
set -e
# dummy empty prerm script to ensure clean upgrades from wheezy
# (that still called install-info)
# See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=726800
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