Motivation for this change

The patch does not apply anymore, but also doesn't look like it's needed anymore. /cc @copumpkin

# if ! (((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3))        \
         && !defined __UCLIBC__)                                            \
        || (defined __APPLE__ && defined __MACH__)                          \
        || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
                fbp[1] = '%';
                fbp[2] = 'n';
                fbp[3] = '\0';
# else

Things done

Please check what applies. Note that these are not hard requirements but merely serve as information for reviewers.

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.