[issue43908] array.array should remain immutable: add Py_TPFLAGS_IMMUTABLETYPE flag

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

> check_set_special_type_attr() must also be updated to check for Py_TPFLAGS_IMMUTABLETYPE flag.

Ok, lets just use this issue for the PR. I can fix it in an hour or so.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43908>
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