compile fixes for Linux

Demos/OpenGL/GLDebugFont.cpp

@@ -88,7 +88,7 @@ void	GLDebugDrawString(int x,int y,const char* string)
 
 		for (int i=0;i<strlen(string);i++)
 		{
-			unsigned char ch = string[i]-32;
+			char ch = string[i]-32;
 			if (ch>=0)
 			{
 				cx=float(ch%16) * 1./16.f;

Demos/OpenGL/GLDebugFont.h

@@ -21,3 +21,4 @@ void	GLDebugDrawString(int x,int y,const char* string);
 void	GLDebugResetFont(int screenWidth,int screenHeight);
 
 #endif //BT_DEBUG_FONT_H
+

Demos/OpenGL/GL_ShapeDrawer.h

@@ -67,3 +67,4 @@ void OGL_displaylist_register_shape(btCollisionShape * shape);
 void OGL_displaylist_clean();
 
 #endif //GL_SHAPE_DRAWER_H
+

Demos/OpenGL/GlutDemoApplication.cpp

@@ -82,3 +82,4 @@ void GlutDemoApplication::swapBuffers()
 }
 
 #endif //_WINDOWS
+

Demos/OpenGL/GlutDemoApplication.h

@@ -31,3 +31,4 @@ public:
 
 };
 #endif //GLUT_DEMO_APPLICATION_H
+

Demos/OpenGL/GlutStuff.h

@@ -27,7 +27,7 @@ subject to the following restrictions:
 #else
 
 #include <GL/glut.h>
-#ifndef _WINDOWS
+#ifdef _WINDOWS
 #include <windows.h>
 #include <GL/gl.h>
 #include <GL/glu.h>

src/BulletDynamics/Dynamics/btActionInterface.h

@@ -37,3 +37,4 @@ class btActionInterface
 };
 
 #endif //_BT_ACTION_INTERFACE_H
+