Removed WITH_CYCLE_GC #ifdef-ery. Holes:

+ I'm not sure what to do about configure.in.  Left it alone.

+ Ditto pyexpat.c.  Fred or Martin will know what to do.

Include/Python.h

@@ -23,6 +23,14 @@
 #include "patchlevel.h"
 #include "pyconfig.h"
 
+/* Cyclic gc is always enabled, starting with release 2.3a1.  Supply the
+ * old symbol for the benefit of extension modules written before then
+ * that may be conditionalizing on it.  The core doesn't use it anymore.
+ */
+#ifndef WITH_CYCLE_GC
+#define WITH_CYCLE_GC 1
+#endif
+
 #ifdef HAVE_LIMITS_H
 #include <limits.h>
 #endif