[issue23924] Add OS X to Dev Guide Quickstart build step

[Roundup Robot]

Roundup Robot added the comment:

New changeset 56b0001c7a29 by Ned Deily in branch 'default':
Issue #23924: Expand the QuickStart section to mention OS X and link
https://hg.python.org/devguide/rev/56b0001c7a29

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23924>
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