Update lib_build_win.bat

engine/Scripts/lib_build_win.bat

  shift
 if not "%1" == "" goto GETOPTS
 
-cmd /k python3 lib_build.py -m %runtime_mode% -r %engine_path% -p windows -v %vs_path%
+cmd /k python3 lib_build.py -m %runtime_mode% -r %engine_path% -p windows -v %vs_path%