Don't generate calls to
SWIGPY_BINARYFUNC_CLOSURE(_wrap___lshift__)
for the 'global' function wrappers for the friend functions.
Only occurred when a friend class is within a namespace due to the
renames in pyopers.swg, such as:
%rename(__lshift__) *::operator<<;
The rename was intended for member functions but was also being attached
to friends that are within a namespace.
William S Fulton