prerm is in libwxgtk2.6-dbg 2.6.3.2.2-5ubuntu4.
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/wx/config/gtk2-unicode-debug-2.6
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