binutils: move src hack out of srcs attrset

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

@@ -33,11 +33,10 @@ let
   version = "2.38";
 
   srcs = {
-    # HACK: to ensure that we preserve source from bootstrap binutils to not rebuild LLVM
-    normal = stdenv.__bootPackages.binutils-unwrapped.src or (fetchurl {
+    normal = fetchurl {
       url = "mirror://gnu/binutils/binutils-${version}.tar.bz2";
       sha256 = "sha256-Bw7HHPB3pqWOC5WfBaCaNQFTeMLYpR6Q866r/jBZDvg=";
-    });
+    };
     vc4-none = fetchFromGitHub {
       owner = "itszor";
       repo = "binutils-vc4";
@@ -55,7 +54,10 @@ stdenv.mkDerivation {
   pname = targetPrefix + "binutils";
   inherit version;
 
-  src = srcs.${targetPlatform.system} or srcs.normal;
+  # HACK: Ensure that we preserve source from bootstrap binutils to not rebuild LLVM
+  src = stdenv.__bootPackages.binutils-unwrapped.src
+    or srcs.${targetPlatform.system}
+    or srcs.normal;
 
   # WARN: this package is used for bootstrapping fetchurl, and thus cannot use
   # fetchpatch! All mutable patches (generated by GitHub or cgit) that are