Explicitly call VertexBufferManager cleanup code, since we can't rely on

the order of destructors called for global instances.

This was SVN commit r2846.

source/ps/GameSetup/GameSetup.cpp

@@ -728,6 +728,7 @@ void Shutdown()
 	// destroy renderer
 	TIMER_START("shutdown Renderer");
 	delete &g_Renderer;
+	g_VBMan.Shutdown();
 	TIMER_END("shutdown Renderer");
 
 	TIMER_START("shutdown ConfigDB");

source/renderer/VertexBufferManager.cpp

@@ -18,6 +18,14 @@ CVertexBufferManager g_VBMan;
 // janwas 2004-06-14: added dtor
 
 CVertexBufferManager::~CVertexBufferManager()
+{
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Explicit shutdown of the vertex buffer subsystem.
+// This avoids the ordering issues that arise when using destructors of
+// global instances.
+void CVertexBufferManager::Shutdown()
 {
 	debug_printf("CVertexBufferManager shutdown\n");
 	

source/renderer/VertexBufferManager.h

@@ -20,6 +20,9 @@ public:
 	CVertexBufferManager() {}
 	~CVertexBufferManager();
 
+	// Explicit shutdown of the vertex buffer subsystem
+	void Shutdown();
+	
 	// try to allocate a buffer of given number of vertices (each of given size), 
 	// and with the given type - return null if no free chunks available
 	CVertexBuffer::VBChunk* Allocate(size_t vertexSize,size_t numVertices,bool dynamic);