gallium/aux: add PIPE_CAP_MAX_VARYINGS to u_screen
Allows drivers using u_pipe_screen_get_param_defaults
to use a
fallback value for the new pipe cap. Default value of 32 based on what's
used in llvmpipe
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Allows drivers using u_pipe_screen_get_param_defaults
to use a
fallback value for the new pipe cap. Default value of 32 based on what's
used in llvmpipe