[Bug other/112823] -Wincompatible-pointer-types errors in libiberty/simple-object-mach-o.c (missing backport for gcc-11)

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112823

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
At some point, I think we should consider using formal Fixes: git trailers or
something to help find missed backports, but that's another story.