prerm is in libwxgtk2.8-dbg 2.8.12.1+dfsg-2ubuntu2.
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 | #! /bin/sh
set -e
update-alternatives --remove wx-config /usr/lib/x86_64-linux-gnu/wx/config/gtk2-unicode-debug-2.8
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