Fix print function calls in CMakeLists for py3
Created by: webknjaz
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Branch rebased on latest master git pull --rebase upstream master
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Unit tests confirmed to pass by running ./bin/FreeCAD --run-test 0
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Commit message is well-written -
Commit message includes issue #<id>
orfixes #<id>
where<id>
is the associated MantisBT issue id if one exists