qt6.qtwebengine: revert commit that breaks graphics acceleration on Mesa 25.2

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

@@ -64,6 +64,8 @@
   bootstrap_cmds,
   cctools,
   xcbuild,
+
+  fetchpatch,
 }:
 
 qtModule {
@@ -110,6 +112,15 @@ qtModule {
 
     # Reproducibility QTBUG-136068
     ./gn-object-sorted.patch
+
+    # Revert "Create EGLImage with eglCreateDRMImageMESA() for exporting dma_buf"
+    # Mesa 25.2 dropped eglCreateDRMImageMESA, so this no longer works.
+    # There are better ways to do this, but this is the easy fix for now.
+    (fetchpatch {
+      url = "https://invent.kde.org/qt/qt/qtwebengine/-/commit/ddcd30454aa6338d898c9d20c8feb48f36632e16.diff";
+      revert = true;
+      hash = "sha256-ht7C3GIEaPtmMGLzQKOtMqE9sLKdqqYCgi/W6b430YU=";
+    })
   ];
 
   postPatch = ''