binutils: disable format hardening

This fails for me:

> compressed_output.cc:320:20: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
>       gold_warning(_("not compressing section data: zlib error"));
>                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ./system.h:40:20: note: expanded from macro '_'
> # define _(String) gettext (String)
>                    ^~~~~~~~~~~~~~~~
> compressed_output.cc:320:20: note: treat the string as an argument to avoid this
>       gold_warning(_("not compressing section data: zlib error"));
>                    ^
>                    "%s",
> ./system.h:40:20: note: expanded from macro '_'
> # define _(String) gettext (String)
                   ^

Disabling format hardening should hopefully be harmless here. If it's a problem we can also make it conditional.

/cc @Ericson2314

pkgs/development/tools/misc/binutils/default.nix

@@ -103,6 +103,8 @@ stdenv.mkDerivation rec {
     then "-Wno-string-plus-int -Wno-deprecated-declarations"
     else "-static-libgcc";
 
+  hardeningDisable = [ "format" ];
+
   # TODO(@Ericson2314): Always pass "--target" and always targetPrefix.
   configurePlatforms = [ "build" "host" ] ++ stdenv.lib.optional (targetPlatform != hostPlatform) "target";