Move glew handling into a separate header file

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@19248 383ad7c9-94d9-4d36-a494-682f7c89f535

widgets/glWidget/QtBaseViewer_glew.cc

@@ -40,7 +40,7 @@
 *                                                                            *
 \*===========================================================================*/
 
-#include <GL/glew.h>
+#include <ACG/GL/acg_glew.hh>
 #include <ACG/GL/GLError.hh>
 
 #include "QtBaseViewer.hh"

widgets/glWidget/QtGLGraphicsScene.cc

@@ -51,7 +51,7 @@
 
 //== INCLUDES =================================================================
 
-#include <GL/glew.h>
+#include <ACG/GL/acg_glew.hh>
 #include <OpenFlipper/BasePlugin/PluginFunctions.hh>
 #include "QtGLGraphicsScene.hh"
 #include "QtMultiViewLayout.hh"

widgets/glWidget/simpleGLGraphicsScene.cc

@@ -51,7 +51,7 @@
 
 //== INCLUDES =================================================================
 
-#include <GL/glew.h>
+#include <ACG/GL/acg_glew.hh>
 #include <OpenFlipper/common/GlobalOptions.hh>
 #include <OpenFlipper/BasePlugin/PluginFunctions.hh>
 #include <OpenFlipper/widgets/glWidget/QtBaseViewer.hh>