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gnatboot12: Use bintoolsDualAs on x86_64-darwin
As documented in pkgs/os-specific/darwin/binutils/default.nix, the Clang integrated assembler is needed in addition to the cctools-port assembler usually used on x86_64-darwin in order to build gnat12 with the x86_64-darwin gnatboot12 bootstrap compiler. This commit alters the gnatboot12 wrapper on x86_64-darwin so that both of those assemblers are available as required.