st/mesa: don't enable NV_copy_depth_to_color if NIR doesn't support FP64
Fixes: e512f2ce - mesa: add NV_copy_depth_to_color support for nir Closes: #3459 (closed)
Fixes: e512f2ce - mesa: add NV_copy_depth_to_color support for nir Closes: #3459 (closed)