[Bug go/126144] libgo doesn't build on NetBSD

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126144

--- Comment #1 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 64954
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64954&action=edit
Proposed patch