lavapipe: Lock around CSO destroys
Running KHR-GL46.layout_binding.sampler2D_layout_binding_texture_ComputeShader
in a loop for 5 minutes doesn't crash with this patch.
Running KHR-GL46.layout_binding.sampler2D_layout_binding_texture_ComputeShader
in a loop for 5 minutes doesn't crash with this patch.