staticforward bites the dust.

The staticforward define was needed to support certain broken C
compilers (notably SCO ODT 3.0, perhaps early AIX as well) botched the
static keyword when it was used with a forward declaration of a static
initialized structure.  Standard C allows the forward declaration with
static, and we've decided to stop catering to broken C compilers.  (In
fact, we expect that the compilers are all fixed eight years later.)

I'm leaving staticforward and statichere defined in object.h as
static.  This is only for backwards compatibility with C extensions
that might still use it.

XXX I haven't updated the documentation.
diff --git a/Objects/listobject.c b/Objects/listobject.c
index d0d1127..8173025 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -1282,7 +1282,7 @@
 
 #undef SETK
 
-staticforward PyTypeObject immutable_list_type;
+static PyTypeObject immutable_list_type;
 
 static PyObject *
 listsort(PyListObject *self, PyObject *args)