Pybind11 exception registration workaround

Morten Ofstadrequested to merge
cherry-pick-d58e8b51 into 3.4

Use an older implementation of the register_exception from pybind11 when compiling against Python 3.6 to work around the new implementation hanging when used with Python 3.6.

(cherry picked from commit d58e8b51)

Co-authored-by: Morten Ofstad morten.ofstad@bluware.com

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