bpo-32125: Remove Py_UseClassExceptionsFlag flag (#4544)

This flag was deprecated and wasn't used anymore since Python 2.0.

Include/pydebug.h

@@ -15,7 +15,6 @@ PyAPI_DATA(int) Py_InspectFlag;
 PyAPI_DATA(int) Py_OptimizeFlag;
 PyAPI_DATA(int) Py_NoSiteFlag;
 PyAPI_DATA(int) Py_BytesWarningFlag;
-PyAPI_DATA(int) Py_UseClassExceptionsFlag;
 PyAPI_DATA(int) Py_FrozenFlag;
 PyAPI_DATA(int) Py_IgnoreEnvironmentFlag;
 PyAPI_DATA(int) Py_DontWriteBytecodeFlag;

Misc/NEWS.d/next/C API/2017-11-24-21-25-43.bpo-32125.K8zWgn.rst

+The ``Py_UseClassExceptionsFlag`` flag has been removed. It was deprecated
+and wasn't used anymore since Python 2.0.

Python/pylifecycle.c

@@ -116,7 +116,6 @@ int Py_InspectFlag; /* Needed to determine whether to exit at SystemExit */
 int Py_OptimizeFlag = 0; /* Needed by compile.c */
 int Py_NoSiteFlag; /* Suppress 'import site' */
 int Py_BytesWarningFlag; /* Warn on str(bytes) and str(buffer) */
-int Py_UseClassExceptionsFlag = 1; /* Needed by bltinmodule.c: deprecated */
 int Py_FrozenFlag; /* Needed by getpath.c */
 int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */
 int Py_DontWriteBytecodeFlag; /* Suppress writing bytecode files (*.pyc) */

Tools/c-globals/ignored-globals.txt

@@ -393,7 +393,6 @@ Py_NoUserSiteDirectory
 Py_OptimizeFlag
 Py_QuietFlag
 Py_UnbufferedStdioFlag
-Py_UseClassExceptionsFlag
 Py_VerboseFlag