VC5Decompressor: we never `yield` from the task, so it can never be picked up by different thread, so no need for `untied`
VC5Decompressor: we never `yield` from the task, so it can never be picked up by different thread, so no need for `untied`

darktable-org/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed