[issue19698] Implement _imp.exec_builtin and exec_dynamic

[Brett Cannon]

Change by Brett Cannon <brett at python.org>:


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keywords: +patch
pull_requests: +18518
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/19158

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19698>
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