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