They might have moved the settings, Wolf, cause Cycles does have it, they even rendered Cosmos Laundromat in Anamorphic Widescreen. They might have moved the settings when they updated things to 2.8x is all I can think, but Cycles certainly does have it and I would still expect to find it under the camera DOF Aspect settings unless there is some sort of new advanced tab they moved it to or something like that.

It's actually a relief you cannot find it, because that still might mean that EEVEE might have it