gh-109723: Disable Py_BUILD_CORE in _testcapi (#109727)

Make sure that the internal C API is not tested by mistake by
_testcapi.

Undefine Py_BUILD_CORE_BUILTIN and Py_BUILD_CORE_MODULE macros in
Modules/_testcapi/parts.h: move code from _testcapimodule.c.

heaptype_relative.c and vectorcall_limited.c are using the limited C
API which is incompatible with the internal C API.

Move test_long_numbits() from _testcapi to _testinternalcapi since it
uses the internal C API "pycore_long.h".

Fix Modules/_testcapi/pyatomic.c: don't include Python.h directly,
just include _testcapi/parts.h.

Ajust "make check-c-globals" for these changes.

1 files changed, 18 insertions, 1 deletions

diff --git a/Modules/clinic/_testinternalcapi.c.h b/Modules/clinic/_testinternalcapi.c.h
index 38a3579..c1b4267 100644
--- a/Modules/clinic/_testinternalcapi.c.h
+++ b/Modules/clinic/_testinternalcapi.c.h
@@ -296,4 +296,21 @@ _testinternalcapi_write_unraisable_exc(PyObject *module, PyObject *const *args,
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=c7156622e80df1ce input=a9049054013a1b77]*/
+
+PyDoc_STRVAR(_testinternalcapi_test_long_numbits__doc__,
+"test_long_numbits($module, /)\n"
+"--\n"
+"\n");
+
+#define _TESTINTERNALCAPI_TEST_LONG_NUMBITS_METHODDEF    \
+    {"test_long_numbits", (PyCFunction)_testinternalcapi_test_long_numbits, METH_NOARGS, _testinternalcapi_test_long_numbits__doc__},
+
+static PyObject *
+_testinternalcapi_test_long_numbits_impl(PyObject *module);
+
+static PyObject *
+_testinternalcapi_test_long_numbits(PyObject *module, PyObject *Py_UNUSED(ignored))
+{
+    return _testinternalcapi_test_long_numbits_impl(module);
+}
+/*[clinic end generated code: output=59144f59957627bd input=a9049054013a1b77]*/