Add cs_args as known args for csharp
@@ -1262,7 +1262,7 @@ lang_arg_kwargs = set(['c_args',
vala_kwargs = set(['vala_header', 'vala_gir', 'vala_vapi'])
rust_kwargs = set(['rust_crate_type'])
-cs_kwargs = set(['resources'])
+cs_kwargs = set(['resources', 'cs_args'])
buildtarget_kwargs = set(['build_by_default',
'build_rpath',
