bpo-33443 Fix typo in Python/import.c (GH-6721)

[ukwksk]

In the method, "_PyImportZip_Init(void)", of Python/import.c, the variable, "PyObject *path_hooks, *zimpimport;", seems to be typo, which can be "zipimport".

Modified "zimpimport" to "zipimport" in L. 95, 107, 108, 115, 117 of Python/import.c.

https://bugs.python.org/issue33443

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[the-knights-who-say-ni]

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[matrixise]

Thank you for your Pull Request.