fix padding in btSolverConstraint, see Issue 650

fix some warnings

Demos/OpenGL/GLDebugDrawer.cpp

@@ -12,6 +12,10 @@ GLDebugDrawer::GLDebugDrawer()
 
 }
 
+GLDebugDrawer::~GLDebugDrawer()
+{
+}
+
 void	GLDebugDrawer::drawLine(const btVector3& from,const btVector3& to,const btVector3& fromColor, const btVector3& toColor)
 {
 	glBegin(GL_LINES);

Demos/OpenGL/GLDebugDrawer.h

@@ -12,7 +12,7 @@ class GLDebugDrawer : public btIDebugDraw
 public:
 
 	GLDebugDrawer();
-
+	virtual ~GLDebugDrawer(); 
 
 	virtual void	drawLine(const btVector3& from,const btVector3& to,const btVector3& fromColor, const btVector3& toColor);
 

Demos/OpenGL/GL_Simplex1to4.cpp

@@ -34,6 +34,10 @@ GL_Simplex1to4::GL_Simplex1to4()
 {
 }
 
+GL_Simplex1to4::~GL_Simplex1to4()
+{
+}
+
 ///
 /// Debugging method calcClosest calculates the closest point to the origin, using m_simplexSolver
 ///

Demos/OpenGL/GL_Simplex1to4.h

@@ -28,6 +28,7 @@ class GL_Simplex1to4 : public btBU_Simplex1to4
 	public:
 
 	GL_Simplex1to4();
+	virtual ~GL_Simplex1to4();
 
 	void	calcClosest(btScalar* m);
 

Demos/OpenGL/stb_image.cpp

@@ -1402,7 +1402,6 @@ static uint8 *resample_row_generic(uint8 *out, uint8 *in_near, uint8 *in_far, in
 {
    // resample with nearest-neighbor
    int i,j;
-   in_far = in_far;
    for (i=0; i < w; ++i)
       for (j=0; j < hs; ++j)
          out[i*hs+j] = in_near[i];