Make BenchmarkDemo a console application, without OpenGL/Glut dependency.

Fix potential division by zero when enabling convex distance utility.
Thanks to linzner http://code.google.com/p/bullet/issues/detail?id=264

Demos/OpenGL/GlutDemoApplication.cpp

@@ -1,5 +1,5 @@
 
-#ifndef _WINDOWS
+
 #include "GlutDemoApplication.h"
 
 #include "GlutStuff.h"
@@ -81,5 +81,5 @@ void GlutDemoApplication::swapBuffers()
 
 }
 
-#endif //_WINDOWS
+
 

Demos/OpenGL/GlutStuff.cpp

@@ -70,7 +70,7 @@ static void glutDisplayCallback(void)
 	gDemoApplication->displayCallback();
 }
 
-#ifndef _WINDOWS
+
 int glutmain(int argc, char **argv,int width,int height,const char* title,DemoApplication* demoApp) {
     
 	gDemoApplication = demoApp;
@@ -104,4 +104,4 @@ int glutmain(int argc, char **argv,int width,int height,const char* title,DemoAp
     return 0;
 }
 
-#endif //_WINDOWS
+

Demos/OpenGL/GlutStuff.h

@@ -34,26 +34,7 @@ subject to the following restrictions:
 #endif
 #endif
 
-#ifdef _WINDOWS
-#define BT_KEY_K 'K'
-#define BT_KEY_LEFT			VK_LEFT
-#define BT_KEY_RIGHT		VK_RIGHT
-#define BT_KEY_UP			VK_UP
-#define BT_KEY_DOWN			VK_DOWN
-#define	BT_KEY_F1			VK_F1
-#define	BT_KEY_F2			VK_F2
-#define	BT_KEY_F3			VK_F3
-#define	BT_KEY_F4			VK_F4
-#define	BT_KEY_F5			VK_F5
-#define BT_KEY_PAGEUP		VK_PRIOR
-#define BT_KEY_PAGEDOWN		VK_NEXT
-#define BT_KEY_END			VK_END
-#define BT_KEY_HOME			VK_HOME
-#define BT_ACTIVE_ALT		VK_LMENU
 
-
-
-#else
 #define BT_KEY_K 'k'
 #define BT_KEY_LEFT			GLUT_KEY_LEFT
 #define BT_KEY_RIGHT		GLUT_KEY_RIGHT
@@ -72,7 +53,6 @@ subject to the following restrictions:
 #define	BT_ACTIVE_CTRL		GLUT_ACTIVE_ALT
 #define BT_ACTIVE_SHIFT		GLUT_ACTIVE_SHIFT
 
-#endif
 
 
 #if BT_USE_FREEGLUT