wined3d: Create a backup context if setting the pixel format failed in wined3d_context_gl_create_wgl_ctx().
Signed-off-by: Paul Gofman <gofmanp@gmail.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>