Add Chromium-only Blender WebEngine parity work

blender-5.2.0/build_files/windows/update_sources.cmd

@@ -0,0 +1,10 @@
+if NOT EXIST %PYTHON% (
+    echo python not found, required for this operation
+    exit /b 1
+)
+:detect_python_done
+
+REM Use -B to avoid writing __pycache__ in lib directory and causing update conflicts.
+%PYTHON% -B %BLENDER_DIR%\build_files\utils\make_update.py --git-command "%GIT%" %BUILD_UPDATE_ARGS%
+
+:EOF