qt6.qtwebengine: remove nondeterminism from build (#400807)

    # Fix build with Pipewire 1.4

    ./pipewire-1.4.patch

    # Reproducibility QTBUG-136068

    ./gn-object-sorted.patch

  ];

  postPatch =

diff --git a/gn/src/gn/rsp_target_writer.cc b/gn/src/gn/rsp_target_writer.cc

index 6c1c687e99d..097b84b317e 100644

--- a/src/3rdparty/gn/src/gn/rsp_target_writer.cc

+++ b/src/3rdparty/gn/src/gn/rsp_target_writer.cc

@@ -117,8 +117,7 @@ void RspTargetWriter::Run() {

       PathOutput path_output(settings->build_settings()->build_dir(),

                              settings->build_settings()->root_path_utf8(),

                              ESCAPE_NONE);

-      std::vector<SourceFile> object_files;

-      object_files.reserve(target_->sources().size());

+      std::set<SourceFile> object_files;

       for (const auto& source : target_->sources()) {

         const char* tool_type = nullptr;

@@ -128,7 +127,7 @@ void RspTargetWriter::Run() {

             other_files.push_back(source);

           continue;  // No output for this source.

         }

-        object_files.push_back(

+        object_files.insert(

             tool_outputs[0].AsSourceFile(settings->build_settings()));

       }

       if (target_->config_values().has_precompiled_headers()) {

@@ -137,7 +136,7 @@ void RspTargetWriter::Run() {

         if (tool_cxx && tool_cxx->precompiled_header_type() == CTool::PCH_MSVC) {

           GetPCHOutputFiles(target_, CTool::kCToolCxx, &tool_outputs);

           if (!tool_outputs.empty())

-            object_files.push_back(

+            object_files.insert(

                 tool_outputs[0].AsSourceFile(settings->build_settings()));

         }

       }