WAF: derive the variable NS3_MODULES from the 'all_modules' list in src/wscript, instead of requiring every module to define a configure function to register themselves. This way module registration is done in one place only: src/wscript. Requires module naming conventions, though.

src/node/wscript

@@ -1,9 +1,5 @@
 ## -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
 
-def configure(conf):
-    conf.env.append_value('NS3_MODULES', 'ns3-node')
-
-
 def build(bld):
     node = bld.create_obj('cpp', 'shlib')
     node.name = 'ns3-node'