all: remove some more unused code found by staticcheck
Mostly code which became unused after removing evalv2,
but also other bits which became unused due to other refactors.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I1496b5b8e9562f10af6b5895b29158a70c18c0b8
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1220029
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Marcel van Lohuizen <mpvl@gmail.com>