Exclude tkinter from cx_freeze
From https://discuss.tryton.org/t/how-to-build-windows-64-bits-tryton-client/1757
Recent versions of cx_freeze always try to bundle tkinter which is not needed for tryton and also fails to be bundled.
This instance will be upgraded to Heptapod 1.3.3 (GitLab 16.9.6) on 2023-04-25 at 18:00 UTC+2
From https://discuss.tryton.org/t/how-to-build-windows-64-bits-tryton-client/1757
Recent versions of cx_freeze always try to bundle tkinter which is not needed for tryton and also fails to be bundled.