Restore BsbQuit_excepthook

This is necessary for ipdb.

Closes ipython#14396

IPython/core/debugger.py

@@ -149,6 +149,17 @@ def make_arrow(pad):
     return ''
 
 
+def BdbQuit_excepthook(et, ev, tb, excepthook=None):
+    """Exception hook which handles `BdbQuit` exceptions.
+
+    All other exceptions are processed using the `excepthook`
+    parameter.
+    """
+    raise ValueError(
+        "`BdbQuit_excepthook` is deprecated since version 5.1. It is still arround only because it is still imported by ipdb.",
+    )
+
+
 RGX_EXTRA_INDENT = re.compile(r'(?<=\n)\s+')