rust-src: shrink the size (#72434)

rust-src: shrink the size

pkgs/development/compilers/rust/rust-src.nix

@@ -6,6 +6,6 @@ stdenv.mkDerivation {
   phases = [ "unpackPhase" "installPhase" ];
   installPhase = ''
     mv src $out
-    rm -rf $out/{ci,doc,driver,etc,grammar,llvm,rt,rtstartup,rustllvm,test,tools,vendor}
+    rm -rf $out/{ci,doc,etc,grammar,llvm-project,llvm-emscripten,rtstartup,rustllvm,test,tools,vendor,stdarch}
   '';
 }