Python bindings: fix generation of callback wrappers with the newest pybindgen

bindings/python/wscript

@@ -13,7 +13,7 @@ from waflib.Errors import WafError
 # after = TaskGen.after
 
 ## https://launchpad.net/pybindgen/
-REQUIRED_PYBINDGEN_VERSION = (0, 17, 0, 876)
+REQUIRED_PYBINDGEN_VERSION = (0, 17, 0, 866)
 REQUIRED_PYGCCXML_VERSION = (0, 9, 5)
 
 RUN_ME=-3
@@ -265,7 +265,7 @@ int main ()
         conf.report_optional_feature("pygccxml", "Python API Scanning Support", False,
                                      "pygccxml too old")
         return
-    
+
 
     ## Check gccxml version
     try:
@@ -409,7 +409,7 @@ class gen_ns3_compat_pymod_task(Task.Task):
     """Generates a 'ns3.py' compatibility module."""
     before = 'cxx'
     color = 'BLUE'
-    
+
     def run(self):
         assert len(self.outputs) == 1
         outfile = file(self.outputs[0].abspath(), "w")