Allows sdist to work with old-style extensions

[c3ca32fb-6348-4401-a959-15703a140c76]

BPO	400659
Files	None: None

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = None closed_at = created_at = labels = ['library'] title = 'Allows sdist to work with old-style extensions' updated_at = user = 'https://bugs.python.org/hgebel' ``` bugs.python.org fields: ```python activity = actor = 'gward' assignee = 'gward' closed = True closed_date = None closer = None components = ['Distutils'] creation = creator = 'hgebel' dependencies = [] files = ['2482'] hgrepos = [] issue_num = 400659 keywords = ['patch'] message_count = 2.0 messages = ['32914', '32915'] nosy_count = 2.0 nosy_names = ['gward', 'hgebel'] pr_nums = [] priority = 'normal' resolution = 'rejected' stage = None status = 'closed' superseder = None type = None url = 'https://bugs.python.org/issue400659' versions = [] ```

[c3ca32fb-6348-4401-a959-15703a140c76]

[36a699a8-3b7f-4e71-b274-880655ed5d64]

Fixed differently.