[3.7] bpo-28411: Fix redundant declaration of _PyImport_AddModuleObject (GH-7992)

[miss-islington]

(cherry picked from commit f874bd1)

Co-authored-by: Jeremy Cline jeremy@jcline.org

https://bugs.python.org/issue28411

[the-knights-who-say-ni]

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[miss-islington]

@jeremycline and @ericsnowcurrently: Backport status check is done, and it's a success ✅ .