added "magic" number to the _sre module, to avoid weird errors caused
by compiler/engine mismatches
diff --git a/Modules/sre_constants.h b/Modules/sre_constants.h
index 6cad089..c6850ad 100644
--- a/Modules/sre_constants.h
+++ b/Modules/sre_constants.h
@@ -11,6 +11,7 @@
  * See the _sre.c file for information on usage and redistribution.
  */
 
+#define SRE_MAGIC 20010115
 #define SRE_OP_FAILURE 0
 #define SRE_OP_SUCCESS 1
 #define SRE_OP_ANY 2