Support ms-tnef attachments for embedded OL items
* src/attachment.cpp (Attachment::Attachment): Fall back to save_as_file when attachment is not available in oom. * src/mimemaker.cpp (infer_content_type): Infer ms-tnef for .msg attachments.
This allows attaching mails, contacts and events to encrypted /
signed messages using the new attachment handling code that
works in memory and outside of MAPI.
- GnuPG-Bug-Id: T4184