libjxl, jpegli: Fix file conflicts when installed together. Fixes #533459

Done by moving the benchmarks and library files to separate outputs
so one can reference only `.bin` in `systemPackages`,
avoiding the overlapping names:

    bin/benchmark_xl
    lib/libjxl_cms.so
    lib/libjxl_threads.so
    lib/libjxl_extras_codec.a

For jpegli, a `dev` output also needed to be added to remove a cyclic
reference (from `out` to `bin`):
With a `bin` output newly present, the nixpkgs `multiple-outputs` hook
emits `nix-support/propagated-build-inputs` (which lists the `bin` output)
as development metadata. Without a `dev` output this lands in `out`,
creating an `out -> bin -> out` reference cycle (`bin` links the runtime
libs in `out`).
Example of what was in `bin`'s `nix-support/propagated-build-inputs`:

    /nix/store/99f61f783cd29k1gmr7hrxjnb4v584jn-jpegli-0-unstable-2026-04-30-bin /nix/store/320lmb4fnd2x5alv9hlpdlgz73aj8f26-jpegli-0-unstable-2026-04-30

Creating `dev` moves `nix-support` there, breaking the cycle
and matching the `libjxl` output layout.

Assisted-By: Claude Opus 4.8 in Zoo Code

pkgs/by-name/jp/jpegli/package.nix

@@ -31,7 +31,10 @@ stdenv.mkDerivation {
 
   outputs = [
     "out"
+    "bin"
+    "dev"
     "man"
+    "benchmark"
   ];
 
   strictDeps = true;
@@ -70,6 +73,12 @@ stdenv.mkDerivation {
     (lib.cmakeFeature "CMAKE_POLICY_VERSION_MINIMUM" "3.5")
   ];
 
+  # Move `benchmark_xl` into a separate output to avoid a file collision
+  # with the `benchmark_xl` binary provided by `libjxl`.
+  postInstall = ''
+    moveToOutput "bin/benchmark_xl" "$benchmark"
+  '';
+
   doCheck = true;
 
   passthru = {

pkgs/by-name/li/libjxl/package.nix

@@ -35,7 +35,9 @@ stdenv.mkDerivation rec {
 
   outputs = [
     "out"
+    "bin"
     "dev"
+    "benchmark"
   ];
 
   src = fetchFromGitHub {
@@ -150,18 +152,22 @@ stdenv.mkDerivation rec {
       --replace 'sh$' 'sh( -e$|$)'
   '';
 
-  postInstall =
-    lib.optionalString enablePlugins ''
-      GDK_PIXBUF_MODULEDIR="$out/${gdk-pixbuf.moduleDir}" \
-      GDK_PIXBUF_MODULE_FILE="$out/${loadersPath}" \
-        gdk-pixbuf-query-loaders --update-cache
-    ''
-    # Cross-compiled gdk-pixbuf doesn't support thumbnailers
-    + lib.optionalString (enablePlugins && stdenv.hostPlatform == stdenv.buildPlatform) ''
-      mkdir -p "$out/bin"
-      makeWrapper ${gdk-pixbuf}/bin/gdk-pixbuf-thumbnailer "$out/libexec/gdk-pixbuf-thumbnailer-jxl" \
-        --set GDK_PIXBUF_MODULE_FILE "$out/${loadersPath}"
-    '';
+  # Move `benchmark_xl` into a separate output to avoid a file collision
+  # with the `benchmark_xl` binary provided by `jpegli`.
+  postInstall = ''
+    moveToOutput "bin/benchmark_xl" "$benchmark"
+  ''
+  + lib.optionalString enablePlugins ''
+    GDK_PIXBUF_MODULEDIR="$out/${gdk-pixbuf.moduleDir}" \
+    GDK_PIXBUF_MODULE_FILE="$out/${loadersPath}" \
+      gdk-pixbuf-query-loaders --update-cache
+  ''
+  # Cross-compiled gdk-pixbuf doesn't support thumbnailers
+  + lib.optionalString (enablePlugins && stdenv.hostPlatform == stdenv.buildPlatform) ''
+    mkdir -p "$out/bin"
+    makeWrapper ${gdk-pixbuf}/bin/gdk-pixbuf-thumbnailer "$out/libexec/gdk-pixbuf-thumbnailer-jxl" \
+      --set GDK_PIXBUF_MODULE_FILE "$out/${loadersPath}"
+  '';
 
   env = lib.optionalAttrs stdenv.hostPlatform.isAarch32 {
     CXXFLAGS = "-mfp16-format=ieee";