buildDartApplication: Generate LD_LIBRARY_PATH at build time

This allows setup hooks to add runtime dependencies.

pkgs/build-support/dart/build-dart-application/default.nix

···
   baseDerivation = stdenv.mkDerivation (finalAttrs: (builtins.removeAttrs args [ "gitHashes" "sdkSourceBuilders" "pubspecLock" ]) // {
     inherit pubspecLockFile packageConfig sdkSetupScript pubGetScript
       dartCompileCommand dartOutputType dartRuntimeCommand dartCompileFlags
-      dartJitFlags runtimeDependencies;
+      dartJitFlags;
 
     outputs = args.outputs or [ ] ++ [ "out" "pubcache" ];
 
···
       then writeText "entrypoints.json" (builtins.toJSON dartEntryPoints)
       else null;
 
-    runtimeDependencyLibraryPath = lib.makeLibraryPath finalAttrs.runtimeDependencies;
+    runtimeDependencies = map lib.getLib runtimeDependencies;
 
     nativeBuildInputs = (args.nativeBuildInputs or [ ]) ++ [
       dart

pkgs/build-support/dart/build-dart-application/hooks/dart-fixup-hook.sh

···
     #
     # This could alternatively be fixed with patchelf --add-needed, but this would cause all the libraries to be opened immediately,
     # which is not what application authors expect.
-    echo "$runtimeDependencyLibraryPath"
-    if [[ ! -z "$runtimeDependencyLibraryPath" ]]; then
-        wrapProgramArgs+=(--suffix LD_LIBRARY_PATH : \"$runtimeDependencyLibraryPath\")
+    APPLICATION_LD_LIBRARY_PATH=""
+    for runtimeDependency in "${runtimeDependencies[@]}"; do
+      addToSearchPath APPLICATION_LD_LIBRARY_PATH "${runtimeDependency}/lib"
+    done
+    if [[ ! -z "$APPLICATION_LD_LIBRARY_PATH" ]]; then
+        wrapProgramArgs+=(--suffix LD_LIBRARY_PATH : \"$APPLICATION_LD_LIBRARY_PATH\")
     fi
 
     if [[ ! -z "$extraWrapProgramArgs" ]]; then