[issue33791] Update README.rst to mention third-party OpenSSL needed for macOS builds

[Ned Deily]

Ned Deily <nad at python.org> added the comment:


New changeset ee994d7443a7e2809a5d49bd3679fc9c451a411b by Ned Deily (atg7000) in branch 'master':
bpo-33791: Update README for macOS users (GH-7471)
https://github.com/python/cpython/commit/ee994d7443a7e2809a5d49bd3679fc9c451a411b


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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33791>
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