scx.cscheds: fix build

by doing this in postFixup, we hopefully don't create a cycle
here obviously this is a dirty fix, but better solutions can be
thought later
Closes https://github.com/NixOS/nixpkgs/issues/425498

Signed-off-by: John Titor <50095635+JohnRTitor@users.noreply.github.com>

pkgs/os-specific/linux/scx/scx_cscheds.nix

@@ -118,10 +118,9 @@ llvmPackages.stdenv.mkDerivation (finalAttrs: {
 
   # We copy the compiled header files to the dev output
   # These are needed for the rust schedulers
-  preInstall = ''
-    mkdir -p ${placeholder "dev"}/libbpf ${placeholder "dev"}/bpftool
-    cp -r libbpf/* ${placeholder "dev"}/libbpf/
-    cp -r bpftool/* ${placeholder "dev"}/bpftool/
+  postFixup = ''
+    mkdir -p ${placeholder "dev"}
+    cp -r libbpf ${placeholder "dev"}
   '';
 
   outputs = [

pkgs/os-specific/linux/scx/scx_rustscheds.nix

@@ -20,8 +20,7 @@ rustPlatform.buildRustPackage {
 
   # Copy compiled headers and libs from scx.cscheds
   postPatch = ''
-    mkdir bpftool libbpf
-    cp -r ${scx.cscheds.dev}/bpftool/* bpftool/
+    mkdir libbpf
     cp -r ${scx.cscheds.dev}/libbpf/* libbpf/
   '';