add the macOS specific suffixes from
https: //support.google.com/mail/answer/6590?hl=en#zippy=%2Cmessages-that-have-attachments
Change-Id: I3a834694e3aefb757974cd00ade009874c68c8b4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130397
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>