rustc: disable lld

derivations.nix

@@ -22,7 +22,6 @@ rec {
   });
   rustc = (pkgs.rustc.overrideAttrs(oa: {
     name = "${oa.pname}-${oa.version}-riscv";
-    configureFlags = oa.configureFlags ++ [ "--enable-lld" ];
   })).override {
     inherit llvm_7;
     pkgsBuildBuild = pkgs.pkgsBuildBuild // { inherit llvm_7; };