binutils build issue on new macOS

[sbeamer]

A recent change in macOS's POSIX headers breaks fdopen used by zlib in binutils. The proper fix is to update zlib to 1.3.1 or newer. For the homebrew build of this repo, I have a hack that comments out the macOS specific macros because the default case seems to work (riscv-software-src/homebrew-riscv@8288bc1). I'm posting this issue in case any macOS users run into this issue.

[TommyMurphyTM1234]

Perhaps the issue should also be logged upstream in the GNU Binutils project so that it also eventually gets attention there - if this hasn't been done already?

For what it's worth, this seems to be the relevant Zlib issue:

• Compilation fails with Xcode 16.3 (apple clang 17) madler/zlib#1076

[sbeamer]

Thank you for digging. It looks like binutils has pulled in that newer version of zlib, so when that submodule is bumped in this repo, we may get the fix for free.