Add support for Python 3.11 (See zeroc-ice/ice#1394)

This patch is nearly identical to
zeroc-ice/ice@4d1158b with the
exception that I have just removed the compile.h and eval.h header
inclusions.  They have not been required since Python 2.4 as they
were moved into Python.h.

0002-python-311-support.patch

@@ -0,0 +1,33 @@
+Only in zeroc-ice-3.6.5: setup.py.orig
+diff --color -ur zeroc-ice-3.6.5.orig/src/Slice.cpp zeroc-ice-3.6.5/src/Slice.cpp
+--- zeroc-ice-3.6.5.orig/src/Slice.cpp	2019-07-31 21:49:38.000000000 +0200
++++ zeroc-ice-3.6.5/src/Slice.cpp	2023-10-12 10:52:07.029069937 +0200
+@@ -17,12 +17,6 @@
+ #include <Slice/Util.h>
+ #include <IceUtil/Options.h>
+
+-//
+-// Python headers needed for PyEval_EvalCode.
+-//
+-#include <compile.h>
+-#include <eval.h>
+-
+ using namespace std;
+ using namespace IcePy;
+ using namespace Slice;
+diff --color -ur zeroc-ice-3.6.5.orig/src/Util.cpp zeroc-ice-3.6.5/src/Util.cpp
+--- zeroc-ice-3.6.5.orig/src/Util.cpp	2019-07-31 21:49:38.000000000 +0200
++++ zeroc-ice-3.6.5/src/Util.cpp	2023-10-12 10:49:15.033366926 +0200
+@@ -214,7 +214,12 @@
+     //
+     // Get name of current function.
+     //
++    // Use PyEval_GetFrame with Pyhthon >= 3.11
++#if PY_VERSION_HEX >= 0x030B0000
++    PyFrameObject *f = PyEval_GetFrame();
++#else
+     PyFrameObject *f = PyThreadState_GET()->frame;
++#endif
+     PyObjectHandle code = PyObject_GetAttrString(reinterpret_cast<PyObject*>(f), STRCAST("f_code"));
+     assert(code.get());
+     PyObjectHandle func = PyObject_GetAttrString(code.get(), STRCAST("co_name"));