vrend: fix compute shader binding

Merged Dave Airlie requested to merge airlied/virglrenderer:fix-compute-prog-bind into master

We need to dirty the compute shader if we bind a new non-compute program, this fixes a bug in the qbo tests when qbo is merged.

The test was binding the compute, then non-compute, then compute, but compute prog_ids matched and the subsequent dispatch would fail.

Edited by Dave Airlie

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