qt6.qtwebengine: fix build

pkgs/development/libraries/qt-6/modules/qtwebengine/default.nix

@@ -7,6 +7,7 @@
   buildPackages,
   bison,
   coreutils,
+  fetchpatch2,
   flex,
   gperf,
   ninja,
@@ -110,6 +111,15 @@ qtModule {
 
     # Reproducibility QTBUG-136068
     ./gn-object-sorted.patch
+  ]
+  ++ lib.optionals stdenv.cc.isClang [
+    # https://chromium-review.googlesource.com/c/chromium/src/+/6633292
+    (fetchpatch2 {
+      url = "https://github.com/chromium/chromium/commit/b0ff8c3b258a8816c05bdebf472dbba719d3c491.patch?full_index=1";
+      stripLen = 1;
+      extraPrefix = "src/3rdparty/chromium/";
+      hash = "sha256-zDIlHd8bBtrThkFnrcyA13mhXYIQt6sKsi6qAyQ34yo=";
+    })
   ];
 
   postPatch = ''