llvm-bintools: passthru targetPrefix.

This is expected e.g. by the GHC cross-compilation code

pkgs/development/compilers/llvm/13/bintools/default.nix

@@ -5,7 +5,13 @@ let
     if stdenv.hostPlatform != stdenv.targetPlatform
     then "${stdenv.targetPlatform.config}-"
     else "";
-in runCommand "llvm-binutils-${version}" { preferLocalBuild = true; passthru.isLld = true; } (''
+in runCommand "llvm-binutils-${version}" {
+  preferLocalBuild = true;
+  passthru = {
+    isLld = true;
+    targetPrefix = prefix;
+  };
+} (''
    mkdir -p $out/bin
    for prog in ${lld}/bin/*; do
      ln -s $prog $out/bin/${prefix}$(basename $prog)

pkgs/development/compilers/llvm/14/bintools/default.nix

@@ -5,7 +5,13 @@ let
     if stdenv.hostPlatform != stdenv.targetPlatform
     then "${stdenv.targetPlatform.config}-"
     else "";
-in runCommand "llvm-binutils-${version}" { preferLocalBuild = true; passthru.isLld = true; } (''
+in runCommand "llvm-binutils-${version}" {
+  preferLocalBuild = true;
+  passthru = {
+    isLld = true;
+    targetPrefix = prefix;
+  };
+} (''
    mkdir -p $out/bin
    for prog in ${lld}/bin/*; do
      ln -s $prog $out/bin/${prefix}$(basename $prog)

pkgs/development/compilers/llvm/git/bintools/default.nix

@@ -5,7 +5,13 @@ let
     if stdenv.hostPlatform != stdenv.targetPlatform
     then "${stdenv.targetPlatform.config}-"
     else "";
-in runCommand "llvm-binutils-${version}" { preferLocalBuild = true; passthru.isLld = true; } (''
+in runCommand "llvm-binutils-${version}" {
+  preferLocalBuild = true;
+  passthru = {
+    isLld = true;
+    targetPrefix = prefix;
+  };
+} (''
    mkdir -p $out/bin
    for prog in ${lld}/bin/*; do
      ln -s $prog $out/bin/${prefix}$(basename $prog)