This patch adds the python tools to the potential set of selectable
items within a tools build.  The default remains to build the tools,
and the patch simply allows the specification of PYTHON_TOOLS=n
to omit building them.

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Ben Thomas                                         Virtual Iron Software
bthomas@virtualiron.com                            Tower 1, Floor 2
978-849-1214                                       900 Chelmsford Street
                                                    Lowell, MA 01851