/usr/bin/nonsvnlist is in kdesdk-scripts 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
# This script lists files not in the Subversion repository
svn status --no-ignore "$1" | sed '/^[\?I]/{s/^.......//;p};d'
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