gh-81057: Move More Globals in Core Code to _PyRuntimeState (gh-99516)

https://github.com/python/cpython/issues/81057

Python/modsupport.c

@@ -10,9 +10,6 @@ typedef double va_double;
 static PyObject *va_build_value(const char *, va_list, int);
 static PyObject **va_build_stack(PyObject **small_stack, Py_ssize_t small_stack_len, const char *, va_list, int, Py_ssize_t*);
 
-/* Package context -- the full module name for package imports */
-const char *_Py_PackageContext = NULL;
-
 
 int
 _Py_convert_optional_to_ssize_t(PyObject *obj, void *result)