Fix clean.py (the repo is no longer managed with mercurial)

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Update the minor number.

When the repo was moved from mercurial to git the build system started
build numbers from #1 again. Bump the minor version number to avoid
confusion between these new builds and old builds of the original repo.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>