ubootTools: fix build by fixing -idirafter ordering
`ubootTools` build broke after https://github.com/NixOS/nixpkgs/pull/210004 where we started dropping default libc include path and switched to `-idirafter` way of specifying libc headers. Unfortunately the way it's implemented it injects -idirafter after user's flags, not before. That allows users to inject their paths before libc include paths, not after (as it would notmally happen). The change works it around for u-boot by pulling -idirafter libc flags before user's flags.
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@ -92,6 +92,16 @@ let
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passAsFile = [ "extraConfig" ];
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# Workaround '-idirafter' ordering bug in staging-next:
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# https://github.com/NixOS/nixpkgs/pull/210004
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# where libc '-idirafter' gets added after user's idirafter and
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# breaks.
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# TODO(trofi): remove it in staging once fixed in cc-wrapper.
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preConfigure = ''
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export NIX_CFLAGS_COMPILE_BEFORE_${lib.replaceStrings ["-" "."] ["_" "_"] buildPackages.stdenv.hostPlatform.config}=$(< ${buildPackages.stdenv.cc}/nix-support/libc-cflags)
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export NIX_CFLAGS_COMPILE_BEFORE_${lib.replaceStrings ["-" "."] ["_" "_"] stdenv.hostPlatform.config}=$(< ${stdenv.cc}/nix-support/libc-cflags)
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'';
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configurePhase = ''
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runHook preConfigure
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