scons: Disable saving options automatically.

It makes things too random, as settings for temporary trials get stored
permannently, and it make difficult to build several platforms from the
same tree.

So disable it, again.

SConstruct

@@ -40,7 +40,8 @@ env = Environment(
 	ENV = os.environ,
 )
 
-opts.Save('config.py', env)
+# XXX: This creates a many problems as it saves...
+#opts.Save('config.py', env)
 
 # Backwards compatability with old target configuration variable
 try: