Made VC++ makefiles and project files a bit more consistent

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6520 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/opengl/cube/cube.cpp

@@ -27,6 +27,10 @@
 
 #include "wx/log.h"
 
+#if !wxUSE_GLCANVAS
+#error Please set wxUSE_GLCANVAS to 1 in setup.h.
+#endif
+
 #include "cube.h"
 
 #ifndef __WXMSW__     // for wxStopWatch, see remark below 

samples/opengl/isosurf/isosurf.cpp

@@ -25,6 +25,10 @@
 #include "wx/wx.h"
 #endif
 
+#if !wxUSE_GLCANVAS
+#error Please set wxUSE_GLCANVAS to 1 in setup.h.
+#endif
+
 #include "wx/timer.h"
 #include "wx/glcanvas.h"
 

samples/opengl/penguin/penguin.cpp

@@ -25,6 +25,10 @@
 #include "wx/wx.h"
 #endif
 
+#if !wxUSE_GLCANVAS
+#error Please set wxUSE_GLCANVAS to 1 in setup.h.
+#endif
+
 #include "penguin.h"
 #include <GL/glu.h>
 

samples/opengl/penguin/penguin.h

@@ -59,7 +59,6 @@ public:
 DECLARE_EVENT_TABLE()
 };
 
-
 class TestGLCanvas: public wxGLCanvas
 {
  public: