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vrend: relax fatal error for copy-blits from old guest drivers

Ryan Neph requested to merge ryanneph/virglrenderer:fix-copy-blits into master

Copy-blits between externally-allocated (GBM) surface resources that use glCopyImageSubData trigger a fatal GL error since strict error checking was enabled in commit 8d452da8. The issue has since been fixed in mesa 20.x, but a short-term relaxation is needed to restore functionality to old guests until a guest driver uprev can be carried out.

Signed-off-by: Ryan Neph ryanneph@google.com

/cc @zzyiwei @chadversary @akihiko.odaki

Edited by Ryan Neph

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