[Bug go/93020] Final patches to build gcc-10 on GNU/Hurd

[svante.signell at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93020

--- Comment #2 from Svante Signell <svante.signell at gmail dot com> ---
Created attachment 47531
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47531&action=edit
Fixes libgo syscall test