swig: don't override SWIG_name anymore

It doesn't appear to be necessary and it is somewhat odd.  I'm pretty
sure that the package parameter to %module does whatever this might
have been before.  It's necessary in future revisions anyway.

src/python/swig/event.i

@@ -28,7 +28,7 @@
  * Authors: Nathan Binkert
  */
 
-%module event
+%module(package="m5.internal") event
 
 %{
 #include "base/types.hh"
@@ -102,9 +102,3 @@ class SimLoopExitEvent : public Event
 }
 SimLoopExitEvent *simulate(Tick num_cycles = MaxTick);
 void exitSimLoop(const std::string &message, int exit_code);
-
-%wrapper %{
-// fix up module name to reflect the fact that it's inside the m5 package
-#undef SWIG_name
-#define SWIG_name "m5.internal._event"
-%}