prerm is in civicrm-common 4.7.1+dfsg-2ubuntu1.
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 7 8 | #!/bin/sh
set -e
## Directory <=> symlink update / remove symlinks and empty directories:
find /usr/share/civicrm -xdev -type l -delete
find /usr/share/civicrm -xdev -type d -empty -delete
## -printf 'removed %p\n'
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