runtime: update HURD support for mOS now being embedded
runtime: update HURD support for mOS now being embedded

Fixes https://gcc.gnu.org/PR92842

Change-Id: If0d5a561ad256e1400d5eca77aa0635056bdf0e2
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/210285
Reviewed-by: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>

golang/gofrontend,golang/gofrontend,golang/gofrontend,golang/gofrontend