python_generator::print_arg_in_call: handle isl_ctx arguments
python_generator::print_arg_in_call: handle isl_ctx arguments

This simplifies python_generator::print_method and is a step
towards handling isl_ctx arguments in overloaded methods.

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

Meinersbur/isl,Meinersbur/isl,Meinersbur/isl,Meinersbur/isl