Fixed a crash on linux : 3D scene closing made the application or sometimes...

Fixed a crash on linux : 3D scene closing made the application or sometimes Xorg server. DepthPeeling disabled on linux

--HG--
branch : fw4spl_0.7.5
extra : transplant_source : G/%91%90HDf%EC%CE%DAO%19%D4%EF%84%91J%1D%AC%A0

SrcLib/visu/fwRenderVTK/src/fwRenderVTK/VtkRenderService.cpp

@@ -450,8 +450,10 @@ void VtkRenderService::startContext()
     // For Depth peeling (translucent rendering)
 //    m_interactorManager->getInteractor()->SetRenderWhenDisabled(false);
 
+#ifndef __linux
     m_interactorManager->getInteractor()->GetRenderWindow()->SetAlphaBitPlanes(1);
     m_interactorManager->getInteractor()->GetRenderWindow()->SetMultiSamples(0);
+#endif
 
 //    m_interactor->GetRenderWindow()->PointSmoothingOn();
 //    m_interactor->GetRenderWindow()->LineSmoothingOn();