v2: Expose wined3d_streaming_buffer_map() and wined3d_streaming_buffer_unmap() for strided data upload.
-- v2: wined3d: Add a lower size bound for the streaming buffer allocation. ddraw: Use the wined3d_streaming_buffer helpers to manage the streaming index buffer. ddraw: Use the wined3d_streaming_buffer helpers to manage the streaming vertex buffer. wined3d: Factor out and expose functions to map/unmap wined3d_streaming_buffer.