Fixed some more static analysis issues in the Box2D code

modules/juce_box2d/box2d/Collision/b2DynamicTree.cpp

@@ -642,6 +642,7 @@ void b2DynamicTree::ValidateMetrics(int32 index) const
 	int32 height;
 	height = 1 + b2Max(height1, height2);
 	b2Assert(node->height == height);
+    juce::ignoreUnused (height);
 
 	b2AABB aabb;
 	aabb.Combine(m_nodes[child1].aabb, m_nodes[child2].aabb);

modules/juce_box2d/box2d/Dynamics/b2Body.cpp

@@ -224,6 +224,7 @@ void b2Body::DestroyFixture(b2Fixture* fixture)
 
 	// You tried to remove a shape that is not attached to this body.
 	b2Assert(found);
+    juce::ignoreUnused (found);
 
 	// Destroy any contacts associated with the fixture.
 	b2ContactEdge* edge = m_contactList;