this obsoletes the series at id:20170521124821.23924-1-david@tethera.net Compared to the previous series, it contains a leak fix for g_mime_stream_stdout_new(), the actual leak fixes promised in the last patch of the previous series, and modifications to some of the multipart tests so that headers are no longer expected when printing multipart bodies; as discussed in id:878tlpyyfi.fsf@tethera.net and confirmed with gmime upstream, that behaviour can be considered a bug in gmime-2.6, and goes away in gmime-3.0