rust: include the rustc-dev component

This enables to compile rls and rustc

See also https://github.com/rust-lang/rust/pull/64823

pkgs/development/compilers/rust/rustc.nix

@@ -132,9 +132,14 @@ in stdenv.mkDerivation rec {
   outputs = [ "out" "man" "doc" ];
   setOutputFlags = false;
 
-  # remove references to llvm-config in lib/rustlib/x86_64-unknown-linux-gnu/codegen-backends/librustc_codegen_llvm-llvm.so
-  # and thus a transitive dependency on ncurses
   postInstall = ''
+    # install rustc-dev components. Necessary to build rls, clippy...
+    python x.py dist rustc-dev
+    tar xf build/dist/rustc-dev*tar.gz
+    cp -r rustc-dev*/rustc-dev*/lib/* $out/lib/
+
+    # remove references to llvm-config in lib/rustlib/x86_64-unknown-linux-gnu/codegen-backends/librustc_codegen_llvm-llvm.so
+    # and thus a transitive dependency on ncurses
     find $out/lib -name "*.so" -type f -exec remove-references-to -t ${llvmShared} '{}' '+'
   '';