Mark mcxx as broken and remove from package list

nixseparatedebuginfod has been replaced by nixseparatedebuginfod2

pkgs/intel-oneapi/2023.nix

@@ -414,14 +414,13 @@ let
   wrapIntel = { cc, mygcc, extraBuild ? "", extraInstall ? "" }:
     let
       targetConfig = stdenv.targetPlatform.config;
-      gccVersion = builtins.concatStringsSep "." (lib.take 3 (builtins.splitVersion mygcc.version));
     in (wrapCCWith {
       cc = cc;
       extraBuildCommands = ''
         echo "-isystem ${cc}/include" >> $out/nix-support/cc-cflags
         echo "-isystem ${cc}/include/intel64" >> $out/nix-support/cc-cflags
 
-        echo "-L${mygcc.cc}/lib/gcc/${targetConfig}/${gccVersion}" >> $out/nix-support/cc-ldflags
+        echo "-L${mygcc.cc}/lib/gcc/${targetConfig}/${mygcc.version}" >> $out/nix-support/cc-ldflags
         echo "-L${mygcc.cc.lib}/lib" >> $out/nix-support/cc-ldflags
         echo "-L${intel-compiler-shared}/lib" >> $out/nix-support/cc-ldflags
         echo "-L${cc}/lib" >> $out/nix-support/cc-ldflags