Fix SWIG_Py*Method_New conditional

This should be a SWIG-time conditional, but was inside %{ %} so was
instead a compile-time conditional.

Fix for bug in the changes in #2191

Lib/python/pyinit.swg

@@ -107,8 +107,20 @@ SWIG_Python_FixMethods(PyMethodDef *methods, const swig_const_info *const_table,
   }
 } 
 
+#ifdef __cplusplus
+}
+#endif
+
+%}
+
 #if defined SWIGPYTHON_FASTPROXY && !defined SWIGPYTHON_BUILTIN
 
+%init %{
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* -----------------------------------------------------------------------------
  * Method creation and docstring support functions
  * ----------------------------------------------------------------------------- */
@@ -167,12 +179,16 @@ SWIGINTERN PyObject *SWIG_PyStaticMethod_New(PyObject *SWIGUNUSEDPARM(self), PyO
   return PyStaticMethod_New(func);
 }
 
-#endif
-
 #ifdef __cplusplus
 }
 #endif
 
+%}
+
+#endif
+
+%init %{
+
 /* -----------------------------------------------------------------------------*
  *  Partial Init method
  * -----------------------------------------------------------------------------*/