Avoid rebuild during make fake.

Index: setup_configure.py
--- setup_configure.py.orig
+++ setup_configure.py
@@ -178,8 +178,8 @@ class BuildConfig:
         }
 
     def changed(self):
-        """Has the config changed since the last build?"""
-        return self.as_dict() != load_stashed_config()
+        """Our build is always up to date"""
+        load_stashed_config()
 
     def record_built(self):
         """Record config after a successful build"""