Remove bogus reference to allegrocl:old-sym:name

It'll never be set under -cffi.  Looking at the history it looks like
this is just a remnant from this file being originally created by
copying allegrocl.cxx.
diff --git a/Source/Modules/cffi.cxx b/Source/Modules/cffi.cxx
index 7f584db..6333fa1 100644
--- a/Source/Modules/cffi.cxx
+++ b/Source/Modules/cffi.cxx
@@ -227,7 +227,7 @@
 int CFFI::constructorHandler(Node *n) {
 #ifdef CFFI_DEBUG
   Printf(stderr, "constructor %s\n", Getattr(n, "name"));
-  Printf(stderr, "constructor %s\n and %s and %s", Getattr(n, "kind"), Getattr(n, "sym:name"), Getattr(n, "allegrocl:old-sym:name"));
+  Printf(stderr, "constructor %s\n and %s", Getattr(n, "kind"), Getattr(n, "sym:name"));
 #endif
   Setattr(n, "cffi:constructorfunction", "1");
   // Let SWIG generate a global forwarding function.