* src/abg-reader.cc (build_function_parameter): Support reading
the "is-variadic" attribute.
* src/abg-writer.cc (write_function_decl): Support writing the
"is-variadic" attribute.
* tests/data/test-read-write/test22.xml: New test input.
* tests/test-read-write.cc (in_out_specs): Add the new test to the
list of files to read and write back.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
