OpenGL2: Use CPU vertex animation if too few vertex attributes

OpenGL ES has a minimum of 8 vertex attributes while desktop OpenGL has
a minimum of 16. Vertex animation uses attributes 10 to 12.

code/renderergl2/tr_model.c

@@ -664,6 +664,12 @@ static qboolean R_LoadMD3(model_t * mod, int lod, void *buffer, int bufferSize,
 		surf++;
 	}
 
+	if (mdvModel->numFrames > 1 && !glRefConfig.gpuVertexAnimation)
+	{
+		mdvModel->numVaoSurfaces = 0;
+		mdvModel->vaoSurfaces = NULL;
+	}
+	else
 	{
 		srfVaoMdvMesh_t *vaoSurf;