* import.c (MAGIC): Changed magic word to avoid confusion about exec
  function vs. exec statement
* bltinmodule.c: renamed the module to __builtin__.
* posixmodule.c (posix_execv): renamed exec --> execv since it is now a
  reserved word.
diff --git a/Python/import.c b/Python/import.c
index 4d01daf..f0d4828 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -61,7 +61,7 @@
 
 /* Magic word to reject .pyc files generated by other Python versions */
 
-#define MAGIC 0x999901L /* Increment by one for each incompatible change */
+#define MAGIC 0x999902L /* Increment by one for each incompatible change */
 
 static object *modules;