Add a new executable for windows to run with --software-renderer
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Description

To avoid updating the configuration file manually if openGL crashes in Windows, it would be nice to have 2 executables in the menu, one normal (GCompris.exe --opengl-renderer) and one in Safe-mode (GCompris --software-renderer).
If GRAPHICAL_RENDERER is different from auto, we should only create one executable (with the good option).