qt5/qtwebengine: pick patch to fix build with gcc 12

pkgs/development/libraries/qt-5/5.15/default.nix

···
         extraPrefix = "src/3rdparty/";
         hash = "sha256-MZGYeMdGzwypfKoSUaa56K3inbcGRx7he/+AFyk5ekA=";
       })
+      (fetchpatch {
+        url = "https://raw.githubusercontent.com/Homebrew/formula-patches/7ae178a617d1e0eceb742557e63721af949bd28a/qt5/qt5-webengine-gcc12.patch";
+        stripLen = 1;
+        extraPrefix = "src/3rdparty/";
+        hash = "sha256-s4GsGMJTBNWw2gTJuIEP3tqT82AmTsR2mbj59m2p6rM=";
+      })
     ] ++ lib.optionals stdenv.isDarwin [
       ./qtwebengine-darwin-no-platform-check.patch
       ./qtwebengine-mac-dont-set-dsymutil-path.patch