[3.13] gh-117142: Slightly hacky fix for memory leak of StgInfo (GH-119424) #119468
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Add a funciton that inlines PyObject_GetTypeData and skips
type-checking, so it doesn't need access to the CType_Type object.
This will break if the memory layout changes, but should
be an acceptable solution to enable ctypes in subinterpreters in
Python 3.13.
Mark _ctypes as safe for multiple interpreters
(cherry picked from commit a192547)
Co-authored-by: Petr Viktorin encukou@gmail.com
Co-authored-by: neonene 53406459+neonene@users.noreply.github.com