loxi_ir: minor fix for compability with python <2.7.3
In python <2.7.3, vars() of a namedtuple returns a TypeError.
Using _asdict instead.
diff --git a/loxi_ir/ir.py b/loxi_ir/ir.py
index e2c4a34..8553f62 100644
--- a/loxi_ir/ir.py
+++ b/loxi_ir/ir.py
@@ -360,7 +360,7 @@
member = ir_class(offset = length_info.offset,
base_length = length_info.base_length,
is_fixed_length=length_info.is_fixed_length,
- **convert_member_properties(vars(fe_member)))
+ **convert_member_properties(fe_member._asdict()))
member.of_class = of_class
return member