virgl: Use common clear_texture if host doesn't support the feature
Fixes: a1eabeff (gallium: remove PIPE_CAP_CLEAR_TEXTURE) Closes: #9944 (closed)
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.
Fixes: a1eabeff (gallium: remove PIPE_CAP_CLEAR_TEXTURE) Closes: #9944 (closed)