/usr/bin/svnrevertlast 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 5 6 | #!/bin/sh
echo >&2 "Warning: this script is superfluous"
echo >&2 "Instead, use: svn merge -rBASE:PREV <filename>"
echo >&2
svn merge -r BASE:PREV "$@"
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