cmd/gotype: delete this command in favor of go/types/gotype.go in the std lib

Change-Id: Ifd03e5ec607ff127ab11c307d99877de81aeacf2
Reviewed-on: https://go-review.googlesource.com/37657
Reviewed-by: Paul Jolly <paul@myitcv.org.uk>
Reviewed-by: Alan Donovan <adonovan@google.com>
2 files changed