[lldb] Enforce Py_LIMITED_API in the SWIG typemaps (llvm#168147)

We missed a handful of uses of the Python private API in the SWIG
typemaps because they are included before we include the Python header
that defines Py_LIMITED_API.

This fixes that and guards the last private use on whether or not you're
targeting the limited API. Unfortunately there doesn't appear to be an
alternative, so we have to resort to being slightly less defensive.

Author: JDevlieghere

lldb/bindings/python/python-wrapper.swig

@@ -128,8 +128,11 @@ bool lldb_private::python::SWIGBridge::LLDBSwigPythonCallTypeScript(
 
   PyObject *pfunc_impl = nullptr;
 
-  if (pyfunct_wrapper && *pyfunct_wrapper &&
-      PyFunction_Check(*pyfunct_wrapper)) {
+  if (pyfunct_wrapper && *pyfunct_wrapper
+#ifndef Py_LIMITED_API
+      && PyFunction_Check(*pyfunct_wrapper)
+#endif
+      ) {
     pfunc_impl = (PyObject *)(*pyfunct_wrapper);
     if (pfunc_impl->ob_refcnt == 1) {
       Py_XDECREF(pfunc_impl);

lldb/bindings/python/python.swig

@@ -59,6 +59,11 @@ except ImportError:
 // Parameter types will be used in the autodoc string.
 %feature("autodoc", "1");
 
+// Include lldb-python first as it sets Py_LIMITED_API.
+%begin %{
+#include "../source/Plugins/ScriptInterpreter/Python/lldb-python.h"
+%}
+
 %pythoncode%{
 import uuid
 import re