Remove setup_environ from build-media.py

Review Request #4656 — Created Sept. 27, 2013 and submitted — Latest diff uploaded

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master

Reviewers

Remove setup_environ from build-media.py

The setup_environ call is deprecated, in favor of setting
DJANGO_SETTINGS_MODULE in the environment. I fixed this in manage.py but missed
it here.

Ran build-media.py and saw it work correctly.