Move 'dict' struct member to end of struct.  This ensures binary
compatibility for shared libraries.

*** WARNING -- IF YOU BUILT 1.5.1BETA1, DO A "MAKE CLEAN" ***
diff --git a/Include/pystate.h b/Include/pystate.h
index 443f365..b061fbf 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -73,8 +73,6 @@
 	int ticker;
 	int tracing;
 
-	PyObject *dict;
-
 	PyObject *sys_profilefunc;
 	PyObject *sys_tracefunc;
 
@@ -86,6 +84,8 @@
 	PyObject *exc_value;
 	PyObject *exc_traceback;
 
+	PyObject *dict;
+
 	/* XXX signal handlers should also be here */
 
 } PyThreadState;