androidndkPkgs.binaries: correct passthru parameters

Without this patch ghc 8.10.7 with taget platform aarch64-android fails
to build due an invalid nix expression (missing attribute targetPrefix).
To fix that we make the binaries attribute to conform with the
expectation about unwrapped bintools / cc derivations w.r.t. passthru
attributes.

pkgs/development/androidndk-pkgs/androidndk-pkgs.nix

@@ -56,9 +56,12 @@ rec {
   binaries = runCommand "ndk-toolchain-binutils" {
     pname = "ndk-toolchain-binutils";
     inherit (androidndk) version;
-    isClang = true; # clang based cc, but bintools ld
     nativeBuildInputs = [ makeWrapper ];
     propagatedBuildInputs = [ androidndk ];
+    passthru = {
+      targetPrefix = prefix;
+      isClang = true; # clang based cc, but bintools ld
+    };
   } ''
     mkdir -p $out/bin