fix matplotlib setup.py problem w python 3.5 ref

Description

This resolves the python 3.5 reference error that recently began appearing in new Hawthorn.master native installations.

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Contributor Name

Lawrence McDaniel

Repo

edx/edx-platform

Customer

None

Epic Link

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OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

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Platform Map Area (Levels 3 & 4)

None

Blended Hour Utilization Percentage

None

Priority

Unset
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