[Bug target/81733] stage1 libgcc_s.dylib fails to link on Darwin 11/x86_64

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81733

--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> ---
I think this is a dup of 81033 - please try the attached patch(es) there.